fix: require subscription-aware consent for PVE repository switches

scripts/global/repository-functions.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+# Shared repository policy for package-install and safe-update flows.
+# Proxmox's own repository API parses .list/.sources and edits individual
+# entries. No shell rewriting of operator-maintained APT files.
+repository_policy() {
+    python3 "$(dirname "${BASH_SOURCE[0]}")/repository_policy.py" "$@"
+}
+
+ensure_repositories() {
+    local version suite decision
+    version=$(pveversion 2>/dev/null | grep -oP 'pve-manager/\K[0-9]+' | head -1)
+    case "$version" in
+        8) suite=bookworm ;;
+        9) suite=trixie ;;
+        *) msg_error "$(translate 'Unsupported or unknown Proxmox version; no repository changed.')"; return 1 ;;
+    esac
+    # Do not hide diagnostics or open a spinner during user interaction.
+    decision=$(repository_policy plan "$suite") || return 1
+    case "$decision" in
+        preserve) return 0 ;;
+        offer) ;;
+        *) msg_error "$(translate 'Repository policy returned an unexpected result.')"; return 1 ;;
+    esac
+    if ! declare -F hybrid_yesno >/dev/null || { [[ ! -t 0 ]] && ! { declare -F is_web_mode >/dev/null && is_web_mode; }; }; then
+        msg_error "$(translate 'No subscription and no usable PVE repository. Noninteractive mode cannot change APT sources; configure them in Node > Updates > Repositories.')"
+        return 1
+    fi
+    if ! hybrid_yesno "$(translate 'Proxmox repository')" \
+        "$(translate 'This host has no subscription, switch to the no-subscription repository? The inaccessible Enterprise PVE source will be disabled. Enterprise Ceph sources, if present, will be disabled without choosing a replacement Ceph channel; configure Ceph separately if needed.')" 16 90; then
+        msg_error "$(translate 'Repository switch declined; no APT source changed.')"
+        return 1
+    fi
+    decision=$(repository_policy apply "$suite") || return 1
+    [[ "$decision" == changed || "$decision" == preserve ]] || return 1
+    return 0
+}

scripts/global/repository_policy.py

@@ -0,0 +1,142 @@
+#!/usr/bin/env python3
+"""Proxmox repository policy via its own parsed APT repository API.
+
+Only `notfound` permits an offered switch. Never print raw subscription or
+repository API responses: they can contain subscription keys or credentials.
+"""
+import copy
+import json
+import re
+import subprocess
+import sys
+
+ENDPOINT = '/nodes/localhost/apt/repositories'
+PVE_CHANNELS = {'pve-enterprise', 'pve-no-subscription', 'pve-test', 'pvetest'}
+
+
+def run(args):
+    try:
+        return subprocess.run(args, check=True, capture_output=True, text=True).stdout
+    except (OSError, subprocess.CalledProcessError) as exc:
+        raise ValueError(f'Unable to query or change Proxmox repository state ({args[0]}). Check the service and retry.') from exc
+
+
+def subscription_status():
+    # pvesubscription's CLI get printer emits sorted "key: value" lines,
+    # including a secret key and server ID. Only parse the exact status line.
+    output = run(['pvesubscription', 'get'])
+    statuses = re.findall(r'^status: ([a-z]+)$', output, re.MULTILINE)
+    if len(statuses) != 1 or statuses[0] not in ('active', 'notfound'):
+        raise ValueError('Subscription status is not unambiguously active or notfound. Check pvesubscription get locally; no repository changed.')
+    return statuses[0]
+
+
+def repository_state(suite):
+    try:
+        data = json.loads(run(['pvesh', 'get', ENDPOINT, '--output-format', 'json']))
+        if not isinstance(data, dict) or not isinstance(data['files'], list) or not isinstance(data['errors'], list) or not isinstance(data['digest'], str) or not isinstance(data['standard-repos'], list):
+            raise ValueError()
+        if data['errors']:
+            raise ValueError()
+        entries = []
+        for file in data['files']:
+            for index, row in enumerate(file['repositories']):
+                if not isinstance(row, dict):
+                    raise ValueError()
+                # Flat repositories (e.g. suite './') legitimately omit this.
+                row.setdefault('Components', [])
+                if not isinstance(row['Enabled'], bool) or not all(
+                    isinstance(row[k], list) and all(isinstance(value, str) for value in row[k])
+                    for k in ('Types', 'URIs', 'Suites', 'Components')
+                ):
+                    raise ValueError()
+                entries.append((file['path'], index, row))
+        return data, entries
+    except (KeyError, TypeError, ValueError, IndexError) as exc:
+        raise ValueError('Proxmox APT repository inventory is invalid or reports parse errors. Fix sources in Node > Updates > Repositories; no repository changed.') from exc
+
+
+def evaluate(suite, apply=False):
+    if suite not in ('bookworm', 'trixie'):
+        raise ValueError('Unsupported Proxmox suite; no repository changed.')
+    status = subscription_status()  # fail closed before inventory or any write
+    data, entries = repository_state(suite)
+    pve = []
+    ceph = []
+    debian = False
+    for path, index, row in entries:
+        if not row['Enabled'] or 'deb' not in row['Types']:
+            continue
+        components = set(row['Components'])
+        if components & PVE_CHANNELS:
+            if suite not in row['Suites']:
+                raise ValueError('PVE repository suite does not match the installed version; no repository changed.')
+            pve.append((path, index, row))
+        if 'main' in components and suite in row['Suites'] and not components & PVE_CHANNELS:
+            debian = True
+        if 'enterprise' in components and any('/ceph-' in uri for uri in row['URIs']):
+            if suite not in row['Suites']:
+                raise ValueError('Enterprise Ceph repository suite does not match this PVE version; correct it in the Proxmox repository UI before switching.')
+            ceph.append((path, index, row))
+
+    if status == 'active':
+        if not pve:
+            raise ValueError('Host has an active subscription but no active PVE repository. Configure its Enterprise source in Node > Updates > Repositories; no repository changed.')
+        return 'preserve'
+    if any(set(row['Components']) & {'pve-no-subscription', 'pve-test', 'pvetest'} for _, _, row in pve):
+        return 'preserve'
+    if not debian:
+        raise ValueError('No active Debian base repository for this suite; configure it in the Proxmox repository UI before continuing.')
+    # No active PVE source or only inaccessible Enterprise. A mixed stanza
+    # cannot be disabled without also disabling an unrelated component.
+    disable = [item for item in pve if 'pve-enterprise' in item[2]['Components']] + ceph
+    for _, _, row in disable:
+        expected = {'pve-enterprise'} if 'pve-enterprise' in row['Components'] else {'enterprise'}
+        if set(row['Components']) != expected:
+            raise ValueError('Enterprise shares an APT stanza with other components. Split it in the Proxmox repository UI; no repository changed.')
+    handles = [r.get('handle') for r in data['standard-repos'] if r.get('handle') == 'no-subscription']
+    if len(handles) != 1:
+        raise ValueError('Proxmox no-subscription standard repository handle unavailable; no repository changed.')
+    if not apply:
+        return 'offer'
+    # Adopt a refreshed digest only after checking the complete expected
+    # inventory: path/index targets are unsafe if another writer changed it.
+    expected = copy.deepcopy(data['files'])
+    try:
+        for path, index, original in disable:
+            next(file for file in expected if file['path'] == path)['repositories'][index]['Enabled'] = False
+            run(['pvesh', 'create', ENDPOINT, '--path', path, '--index', str(index),
+                 '--enabled', '0', '--digest', data['digest']])
+            refreshed, current = repository_state(suite)
+            # Per-file digests change when Proxmox serializes the disabled entry.
+            inventory = lambda files: sorted(
+                ({key: value for key, value in file.items() if key != 'digest'} for file in files),
+                key=lambda file: file['path'])
+            if inventory(refreshed['files']) != inventory(expected):
+                raise ValueError('Could not verify the expected repository inventory after Enterprise disable; possible concurrent edit. Inspect the Proxmox repository UI before retrying.')
+            data = refreshed
+        run(['pvesh', 'set', ENDPOINT, '--handle', 'no-subscription', '--digest', data['digest']])
+        _, current = repository_state(suite)
+        if not any(row['Enabled'] and 'deb' in row['Types'] and suite in row['Suites']
+                   and 'pve-no-subscription' in row['Components'] for _, _, row in current) \
+           or any(p == path and i == index and row['Enabled']
+                  for path, index, _ in disable for p, i, row in current):
+            raise ValueError('Could not verify the switched repositories; inspect the Proxmox repository UI before retrying.')
+    except ValueError as exc:
+        raise ValueError('Could not complete or verify the repository switch; changes may be partial and repository state is unknown. Inspect Node > Updates > Repositories before retrying; no automatic rollback was attempted.') from exc
+    return 'changed'
+
+
+def main():
+    try:
+        if len(sys.argv) != 3 or sys.argv[1] not in ('plan', 'apply'):
+            raise ValueError('Usage: repository_policy.py plan|apply bookworm|trixie')
+        print(evaluate(sys.argv[2], apply=sys.argv[1] == 'apply'))
+    except ValueError as exc:
+        print(str(exc), file=sys.stderr)
+        return 1
+    return 0
+
+
+if __name__ == '__main__':
+    sys.exit(main())

scripts/global/share-common.func

@@ -12,88 +12,8 @@
 
 
 
-# ==========================================================
-# Ensure repositories are properly configured
-# ==========================================================
-ensure_repositories() {
-  local pve_version need_update=false
-  pve_version=$(pveversion 2>/dev/null | grep -oP 'pve-manager/\K[0-9]+' | head -1)
-
-  if [[ -z "$pve_version" ]]; then
-    msg_error "$(translate 'Unable to detect Proxmox version.')"
-    return 1
-  fi
-
-  if (( pve_version >= 9 )); then
-    # ===== PVE 9 (Debian 13 - trixie) =====
-    # proxmox.sources (no-subscription) - create if missing.
-    # chmod 0644 explicit on every new .sources file: under the default
-    # root umask 0027 the redirect would land at 0640, which the PVE 9
-    # webgui's repository manager treats as unparseable and silently
-    # hides the source — issue #230.
-    if [[ ! -f /etc/apt/sources.list.d/proxmox.sources ]]; then
-      cat > /etc/apt/sources.list.d/proxmox.sources <<'EOF'
-Enabled: true
-Types: deb
-URIs: http://download.proxmox.com/debian/pve
-Suites: trixie
-Components: pve-no-subscription
-Signed-By: /usr/share/keyrings/proxmox-archive-keyring.gpg
-EOF
-      chmod 0644 /etc/apt/sources.list.d/proxmox.sources
-      need_update=true
-    fi
-
-    # debian.sources - create if missing
-    if [[ ! -f /etc/apt/sources.list.d/debian.sources ]]; then
-      cat > /etc/apt/sources.list.d/debian.sources <<'EOF'
-Types: deb
-URIs: http://deb.debian.org/debian/
-Suites: trixie trixie-updates
-Components: main contrib non-free-firmware
-Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg
-
-Types: deb
-URIs: http://security.debian.org/debian-security/
-Suites: trixie-security
-Components: main contrib non-free-firmware
-Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg
-EOF
-      chmod 0644 /etc/apt/sources.list.d/debian.sources
-      need_update=true
-    fi
-
-  else
-    # ===== PVE 8 (Debian 12 - bookworm) =====
-    local sources_file="/etc/apt/sources.list"
-
-    # Debian base (create or append minimal lines if missing)
-    if ! grep -qE 'deb .* bookworm .* main' "$sources_file" 2>/dev/null; then
-      {
-        echo "deb http://deb.debian.org/debian bookworm main contrib non-free non-free-firmware"
-        echo "deb http://deb.debian.org/debian bookworm-updates main contrib non-free non-free-firmware"
-        echo "deb http://security.debian.org/debian-security bookworm-security main contrib non-free non-free-firmware"
-      } >> "$sources_file"
-      need_update=true
-    fi
-
-    # Proxmox no-subscription list (classic) if missing
-    if [[ ! -f /etc/apt/sources.list.d/pve-no-subscription.list ]]; then
-      echo "deb http://download.proxmox.com/debian/pve bookworm pve-no-subscription" \
-        > /etc/apt/sources.list.d/pve-no-subscription.list
-      need_update=true
-    fi
-  fi
-
-  # apt-get update only if needed or lists are empty
-  if [[ "$need_update" == true ]] || [[ ! -d /var/lib/apt/lists || -z "$(ls -A /var/lib/apt/lists 2>/dev/null)" ]]; then
-    msg_info "$(translate 'Updating APT package lists...')"
-    apt-get update >/dev/null 2>&1 || apt-get update
-    msg_ok "$(translate 'APT package lists updated')"
-  fi
-
-  return 0
-}
+# Repository policy shared with utility installers.
+source "$(dirname "${BASH_SOURCE[0]}")/repository-functions.sh"
 
 
 # ==========================================================

scripts/global/update-pve-safe.sh

@@ -9,36 +9,31 @@
 # Description:
 # Update path intended for a Proxmox host ALREADY in
 # production. Unlike scripts/global/update-pve8.sh and
-# update-pve9_2.sh (invoked by post_install), this variant
-# NEVER modifies the operator's own configuration:
+# update-pve9_2.sh (invoked by post_install), this variant preserves
+# operator-maintained sources unless an unsubscribed host explicitly chooses
+# to switch. Otherwise, the operator's source configuration is preserved:
 #
-#   - Does NOT disable Enterprise / Ceph repositories
-#   - Does NOT delete legacy repo files
+#   - Does NOT silently disable Enterprise / Ceph repositories
+#   - Does NOT delete or deduplicate existing repo files
 #   - Does NOT overwrite proxmox.sources / debian.sources
-#     when they already exist
 #   - Does NOT purge alternative NTP services
 #   - Does NOT force-install zfsutils / chrony /
 #     proxmox-backup-restore-image
 #   - Does NOT write no-firmware-warnings.conf
 #
 # What it DOES:
-#   1. Sanity checks (disk space, network)
-#   2. ensure_repositories() — only when repos are MISSING
+#   1. Sanity checks (disk space)
+#   2. ensure_repositories() — check subscription and request consent if needed
 #   3. apt-get update, with automatic GPG key import when apt
 #      reports NO_PUBKEY (any repo, user's or ours)
-#   4. cleanup_duplicate_repos() — exact URL+Suite+Component
-#      match against proxmox.sources / debian.sources; leaves
-#      unrelated custom `download.proxmox.com/*` and
-#      user-authored pve-*.list files alone; backs each file
-#      up before modifying
-#   5. Detect pending upgrades + security count
-#   6. Confirmation dialog
-#   7. apt-get full-upgrade with --force-confdef / --force-confold
+#   4. Detect pending upgrades + security count
+#   5. Confirmation dialog
+#   6. apt-get full-upgrade with --force-confdef / --force-confold
 #      (never overwrites the operator's edited config files)
-#   8. lvm_repair_check() — refreshes VG metadata when disks
+#   7. lvm_repair_check() — refreshes VG metadata when disks
 #      passed through to guest VMs (DSM, TrueNAS, …) come back
 #      with old PV headers
-#   9. apt-get autoremove + autoclean
+#   8. apt-get autoremove + autoclean
 #
 # Reboot detection is handled by the caller (utilities/proxmox_update.sh).
 # ==========================================================
@@ -66,6 +61,8 @@ source_install_functions() {
     local f="$LOCAL_SCRIPTS/global/utils-install-functions.sh"
     if [[ -f "$f" ]]; then
         source "$f"
+    else
+        return 1
     fi
 }
 
@@ -91,8 +88,11 @@ update_pve_safe() {
     local screen_capture="/tmp/proxmenux_screen_capture_$$.txt"
     : > "$screen_capture"
 
-    download_common_functions
-    source_install_functions
+    if ! download_common_functions || ! source_install_functions; then
+        msg_error "$(translate 'Required update helpers unavailable. Update stopped.')"
+        rm -f "$screen_capture"
+        return 1
+    fi
 
     {
         msg_info2 "$(translate "Detected: Proxmox VE $pve_version — running safe update path")"
@@ -110,39 +110,14 @@ update_pve_safe() {
         return 1
     fi
 
-    # Reachability check: probe the public Proxmox repository over the
-    # transport apt is most likely to use. Many PVE installs use the
-    # official HTTP apt URI, while HTTPS may fail before apt ever runs
-    # if the CDN presents a certificate for another Proxmox hostname.
-    # Accept either transport and let apt-get update report repo-specific
-    # errors in the next step.
-    _repo_reachable() {
-        local url attempt
-        for url in "http://download.proxmox.com/" "https://download.proxmox.com/"; do
-            for attempt in 1 2; do
-                if curl -sfI --connect-timeout 5 --max-time 10 -o /dev/null "$url"; then
-                    return 0
-                fi
-                [[ $attempt -eq 1 ]] && sleep 1
-            done
-        done
-        return 1
-    }
-    if ! _repo_reachable; then
-        msg_error "$(translate "Cannot reach download.proxmox.com. Check network, proxy or DNS.")"
-        echo -e
-        msg_success "$(translate "Press Enter to return to menu...")"
-        read -r
+    # Enterprise hosts and custom mirrors need not reach the public CDN.
+    # The configured sources, not that hostname, are checked by APT below.
+    if ! declare -F ensure_repositories >/dev/null 2>&1 || ! ensure_repositories; then
+        msg_error "$(translate 'Repository check failed. Update stopped.')"
         rm -f "$screen_capture"
         return 1
     fi
 
-    # ── 2. ensure_repositories: adds base Proxmox+Debian repos only if
-    # they don't already exist. On a configured host this is a no-op. ──
-    if declare -f ensure_repositories >/dev/null 2>&1; then
-        ensure_repositories
-    fi
-
     # ── 3. apt-get update with automatic key recovery ──
     local update_output update_exit_code
     update_output=$(apt-get update 2>&1)
@@ -191,11 +166,8 @@ update_pve_safe() {
         fi
     fi
 
-    # ── 4. Precise duplicate cleanup (exact URL+Suite+Component match,
-    # backs up files before modifying). Skipped if unavailable. ──
-    if declare -f cleanup_duplicate_repos >/dev/null 2>&1; then
-        cleanup_duplicate_repos
-    fi
+    # No duplicate-source rewrite here: even a seemingly duplicate entry may
+    # be operator-maintained. Only the consented switch above edits sources.
 
     # ── 5-6. Detect + confirm ──
     local current_pve_version available_pve_version upgradable security_updates

scripts/global/utils-install-functions.sh

@@ -39,95 +39,14 @@ PROXMENUX_UTILS=(
 )
 
 
-# Ensure APT repositories are configured for the current PVE version.
-# Creates missing no-subscription repo entries for PVE8 (bookworm) or PVE9 (trixie).
-# Shared journal helpers, so any script sourcing this file records what
-# it installs without arranging for it.
+# Shared journal helpers for utility installs.
 if [[ -f "${LOCAL_SCRIPTS:-/usr/local/share/proxmenux/scripts}/global/pmx_journal.sh" ]]; then
     source "${LOCAL_SCRIPTS:-/usr/local/share/proxmenux/scripts}/global/pmx_journal.sh"
 fi
 
 
-ensure_repositories() {
-    local FUNC_VERSION="1.0"
-    pmx_journal_context "ensure_repositories" "$FUNC_VERSION"
-    local pve_version need_update=false
-    pve_version=$(pveversion 2>/dev/null | grep -oP 'pve-manager/\K[0-9]+' | head -1)
-
-    if [[ -z "$pve_version" ]]; then
-        msg_error "Unable to detect Proxmox version."
-        return 1
-    fi
-
-    if (( pve_version >= 9 )); then
-        # ===== PVE 9 (Debian 13 - trixie) =====
-        # Force 0644 (world-readable) on every .sources file we drop.
-        # Under the default root umask 0027 the redirect would land at
-        # 0640, which the PVE 9 webgui's repository manager treats as
-        # unparseable and silently hides the source — issue #230.
-        if [[ ! -f /etc/apt/sources.list.d/proxmox.sources ]]; then
-            pmx_write_file /etc/apt/sources.list.d/proxmox.sources <<'EOF'
-Enabled: true
-Types: deb
-URIs: http://download.proxmox.com/debian/pve
-Suites: trixie
-Components: pve-no-subscription
-Signed-By: /usr/share/keyrings/proxmox-archive-keyring.gpg
-EOF
-            chmod 0644 /etc/apt/sources.list.d/proxmox.sources
-            need_update=true
-        fi
-
-        if [[ ! -f /etc/apt/sources.list.d/debian.sources ]]; then
-            pmx_write_file /etc/apt/sources.list.d/debian.sources <<'EOF'
-Types: deb
-URIs: http://deb.debian.org/debian/
-Suites: trixie trixie-updates
-Components: main contrib non-free-firmware
-Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg
-
-Types: deb
-URIs: http://security.debian.org/debian-security/
-Suites: trixie-security
-Components: main contrib non-free-firmware
-Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg
-EOF
-            chmod 0644 /etc/apt/sources.list.d/debian.sources
-            need_update=true
-        fi
-
-    else
-        # ===== PVE 8 (Debian 12 - bookworm) =====
-        local sources_file="/etc/apt/sources.list"
-
-        if ! grep -qE 'deb .* bookworm .* main' "$sources_file" 2>/dev/null; then
-            {
-                echo "deb http://deb.debian.org/debian bookworm main contrib non-free non-free-firmware"
-                echo "deb http://deb.debian.org/debian bookworm-updates main contrib non-free non-free-firmware"
-                echo "deb http://security.debian.org/debian-security bookworm-security main contrib non-free non-free-firmware"
-            } | pmx_append_file "$sources_file"
-            need_update=true
-        fi
-
-        if [[ ! -f /etc/apt/sources.list.d/pve-no-subscription.list ]]; then
-            echo "deb http://download.proxmox.com/debian/pve bookworm pve-no-subscription" \
-                | pmx_write_file /etc/apt/sources.list.d/pve-no-subscription.list
-            need_update=true
-        fi
-    fi
-
-    if [[ "$need_update" == true ]] || [[ ! -d /var/lib/apt/lists || -z "$(ls -A /var/lib/apt/lists 2>/dev/null)" ]]; then
-        msg_info "$(translate "Updating APT package lists...")"
-        apt-get update >/dev/null 2>&1 || apt-get update
-        # Spinner pair: msg_info must be closed before returning.
-        # Without this the next `msg_info` caller spawns a second
-        # spinner on top of ours and the original line never gets
-        # ✓'d — leaving a dangling progress char on screen.
-        msg_ok "$(translate "APT package lists updated")"
-    fi
-
-    return 0
-}
+# Shared subscription and consent policy for all utility callers.
+source "$(dirname "${BASH_SOURCE[0]}")/repository-functions.sh"
 
 
 # Install a single package and verify the resulting command is available.

scripts/gpu_tpu/nvidia_installer.sh

@@ -525,21 +525,24 @@ offer_lxc_updates_if_any() {
 # ==========================================================
 ensure_repos_and_headers() {
   pmx_journal_context "ensure_repos_and_headers" "1.3" "nvidia_installer.sh"
-  # Bootstrap APT repos FIRST. On a fresh Proxmox install the
-  # pve-no-subscription / debian repos aren't configured by default
-  # → `pve-headers-$(uname -r)` and `build-essential` come back as
-  # "Unable to locate package" and the NVIDIA install bails out with
-  # "no cc found". We delegate to the shared helper (same one the
-  # post-install flow uses), which owns its own spinner pair — that's
-  # why this block has to run BEFORE we open our own msg_info.
+  # Check repositories before opening the headers spinner. A fresh ISO may
+  # have Enterprise enabled but no subscription; the shared policy asks the
+  # operator before switching. Refusal stops before driver removal.
   if ! declare -F ensure_repositories >/dev/null 2>&1; then
     local _utils_install="$LOCAL_SCRIPTS/global/utils-install-functions.sh"
     [[ ! -f "$_utils_install" ]] && _utils_install="/usr/local/share/proxmenux/scripts/global/utils-install-functions.sh"
     # shellcheck source=/dev/null
     [[ -f "$_utils_install" ]] && source "$_utils_install"
   fi
-  if declare -F ensure_repositories >/dev/null 2>&1; then
-    ensure_repositories >>"$LOG_FILE" 2>&1 || true
+  if ! declare -F ensure_repositories >/dev/null 2>&1; then
+    msg_error "$(translate 'Repository helper unavailable. NVIDIA installation stopped.')"
+    return 1
+  fi
+  # Keep the consent dialog and diagnostic visible, not just in the log.
+  ensure_repositories 2>&1 | tee -a "$LOG_FILE"
+  if (( PIPESTATUS[0] != 0 )); then
+    msg_error "$(translate 'Repository check failed. NVIDIA installation stopped.')"
+    return 1
   fi
 
   # Now own the spinner for the headers + build-tools check.
@@ -548,7 +551,10 @@ ensure_repos_and_headers() {
   local kver
   kver=$(uname -r)
 
-  apt-get update -qq >>"$LOG_FILE" 2>&1
+  if ! apt-get update -qq >>"$LOG_FILE" 2>&1; then
+    msg_error "$(translate 'APT update failed. Check repository access; NVIDIA installation stopped.')"
+    return 1
+  fi
 
   if ! dpkg -s "pve-headers-$kver" >/dev/null 2>&1 && \
      ! dpkg -s "proxmox-headers-$kver" >/dev/null 2>&1; then
@@ -2184,7 +2190,7 @@ main() {
 
         # Headers before anything else: the build check below needs them,
         # and so does DKMS afterwards.
-        ensure_repos_and_headers
+        ensure_repos_and_headers || exit 1
 
         installer=$(download_nvidia_installer "$DRIVER_VERSION")
         local download_result=$?
@@ -2442,7 +2448,7 @@ auto_reinstall_from_state() {
   # dialogs and confirmations.
   echo "Reinstalling NVIDIA driver $DRIVER_VERSION non-interactively..." | tee -a "$LOG_FILE"
   ensure_workdir
-  ensure_repos_and_headers          >>"$LOG_FILE" 2>&1
+  ensure_repos_and_headers          >>"$LOG_FILE" 2>&1 || return 2
   blacklist_nouveau                 >>"$LOG_FILE" 2>&1
   ensure_modules_config             >>"$LOG_FILE" 2>&1