var. core fixes (bash to sh in fix_gpu_gids ...) (#9666)

* Switch container exec from bash to sh in fix_gpu_gids

Replaces bash with sh for container execution in fix_gpu_gids and updates device matching logic to use a POSIX-compliant case statement. This improves compatibility with containers that may not have bash installed.

* fix(apt): auto-recover from interrupted dpkg operations

When a previous installation is interrupted (e.g., by script error or
user cancellation), dpkg can be left in an inconsistent state requiring
'dpkg --configure -a' to fix.

This change:
- Adds dpkg --configure -a check to ensure_apt_working()
- Adds dpkg --configure -a to retry logic in install_packages_with_retry()
- Adds dpkg --configure -a to retry logic in upgrade_packages_with_retry()

Fixes: Omada Controller update failing after interrupted installation
Reported-in: #9663

misc/tools.func

@@ -192,6 +192,8 @@ install_packages_with_retry() {
     if [[ $retry -le $max_retries ]]; then
       msg_warn "Package installation failed, retrying ($retry/$max_retries)..."
       sleep 2
+      # Fix any interrupted dpkg operations before retry
+      $STD dpkg --configure -a 2>/dev/null || true
       $STD apt update 2>/dev/null || true
     fi
   done
@@ -217,6 +219,8 @@ upgrade_packages_with_retry() {
     if [[ $retry -le $max_retries ]]; then
       msg_warn "Package upgrade failed, retrying ($retry/$max_retries)..."
       sleep 2
+      # Fix any interrupted dpkg operations before retry
+      $STD dpkg --configure -a 2>/dev/null || true
       $STD apt update 2>/dev/null || true
     fi
   done
@@ -1182,6 +1186,12 @@ cleanup_orphaned_sources() {
 # This should be called at the start of any setup function
 # ------------------------------------------------------------------------------
 ensure_apt_working() {
+  # Fix interrupted dpkg operations first
+  # This can happen if a previous installation was interrupted (e.g., by script error)
+  if [[ -f /var/lib/dpkg/lock-frontend ]] || dpkg --audit 2>&1 | grep -q "interrupted"; then
+    $STD dpkg --configure -a 2>/dev/null || true
+  fi
+
   # Clean up orphaned sources first
   cleanup_orphaned_sources