Merge pull request #148 from cha0sCat/master

fix: debian 11 backports is in archive and can block installation

debi.sh

@@ -215,9 +215,12 @@ has_cloud_kernel() {
 # Returns 0 if available, 1 if not
 has_backports() {
     case $suite in
-        buster|bullseye|oldoldstable|bookworm|oldstable|trixie|stable|forky|testing) return
+        bookworm|oldstable|trixie|stable|forky|testing) return
     esac
 
+    # buster|bullseye|oldoldstable DO have backports, but it's in archive.debian.org now
+    # considering mirrors support varies and the code complexity we must accommodate, we just treat them as no backports available
+
     warn "No backports kernel is available for $suite"
 
     return 1
@@ -591,7 +594,7 @@ apt_components=main
 [ "$apt_non_free_firmware" = true ] && apt_components="$apt_components non-free-firmware"
 
 apt_services=updates
-[ "$apt_backports" = true ] && apt_services="$apt_services, backports"
+[ "$apt_backports" = true ] && has_backports && apt_services="$apt_services, backports"
 
 installer_directory="/boot/debian-$suite"