Fix AMD GPU firmware installation by adding non-free repositories

- Add non-free-firmware repository for Debian (Bookworm/Trixie/Sid)
- Add multiverse repository support for Ubuntu
- Install firmware-amd-graphics for all AMD GPUs (not just APUs)
- Improve error handling with warning messages
- Support both Debian and Ubuntu systems

Fixes #10177

CHANGELOG.md

@@ -18,6 +18,10 @@ Exercise vigilance regarding copycat or coat-tailing sites that seek to exploit
 
     - Typo fix in Heimdall install script [@Turcid-uwu](https://github.com/Turcid-uwu) ([#10187](https://github.com/community-scripts/ProxmoxVE/pull/10187))
 
+  - #### 🔧 Refactor
+
+    - Refactor: Backrest [@tremor021](https://github.com/tremor021) ([#10193](https://github.com/community-scripts/ProxmoxVE/pull/10193))
+
 ### 🧰 Tools
 
   - pihole-exporter ([#10091](https://github.com/community-scripts/ProxmoxVE/pull/10091))

misc/tools.func

@@ -2734,11 +2734,57 @@ EOF
       return 1
     }
 
-    # AMD firmware for better GPU support
+    # For AMD GPUs, firmware-amd-graphics requires non-free repositories
     if [[ "$os_id" == "debian" ]]; then
-      $STD apt -y install firmware-amd-graphics 2>/dev/null || true
+      # Add non-free-firmware repository if not already present
+      if [[ ! -f /etc/apt/sources.list.d/non-free-firmware.sources ]]; then
+        if [[ "$os_codename" == "bookworm" ]]; then
+          cat <<EOF >/etc/apt/sources.list.d/non-free-firmware.sources
+Types: deb
+URIs: http://deb.debian.org/debian
+Suites: bookworm bookworm-updates
+Components: non-free-firmware
+
+Types: deb
+URIs: http://deb.debian.org/debian-security
+Suites: bookworm-security
+Components: non-free-firmware
+EOF
+        elif [[ "$os_codename" == "trixie" || "$os_codename" == "sid" ]]; then
+          cat <<EOF >/etc/apt/sources.list.d/non-free-firmware.sources
+Types: deb
+URIs: http://deb.debian.org/debian
+Suites: trixie trixie-updates
+Components: non-free-firmware
+
+Types: deb
+URIs: http://deb.debian.org/debian-security
+Suites: trixie-security
+Components: non-free-firmware
+EOF
+        fi
+        $STD apt update
+      fi
+
+      # Install AMD firmware and libdrm
+      $STD apt -y install libdrm-amdgpu1 firmware-amd-graphics 2>/dev/null || {
+        msg_warn "Failed to install AMD firmware - may need manual installation"
+      }
+    elif [[ "$os_id" == "ubuntu" ]]; then
+      # For Ubuntu, ensure multiverse is enabled (firmware-amd-graphics is in multiverse)
+      if ! grep -qE '^deb.*multiverse' /etc/apt/sources.list /etc/apt/sources.list.d/*.list 2>/dev/null; then
+        $STD add-apt-repository -y multiverse
+        $STD apt update
+      fi
+      
+      # Install AMD firmware and libdrm
+      $STD apt -y install libdrm-amdgpu1 firmware-amd-graphics 2>/dev/null || {
+        msg_warn "Failed to install AMD firmware - may need manual installation"
+      }
+    else
+      # For other distributions, try without adding repositories
+      $STD apt -y install libdrm-amdgpu1 2>/dev/null || true
     fi
-    $STD apt -y install libdrm-amdgpu1 2>/dev/null || true
     ;;
 
   NVIDIA)