diff -Nru casper-1.480/debian/changelog casper-1.480ubuntu1~dviererbe/debian/changelog
--- casper-1.480/debian/changelog	2023-02-05 12:39:30.000000000 +0200
+++ casper-1.480ubuntu1~dviererbe/debian/changelog	2023-02-20 20:53:53.000000000 +0200
@@ -1,3 +1,11 @@
+casper (1.480ubuntu1~dviererbe-ppa1) lunar; urgency=medium
+
+  * Fixed broken link to ISO for live file system during PXE Boot.
+    Casper now parses the full version id with dot release number from 
+    $VERSION of /etc/os-release. (LP: #1990621)
+
+ -- Dominik Viererbe <dominik.viererbe@canonical.com>  Mon, 20 Feb 2023 20:53:53 +0200
+
 casper (1.480) lunar; urgency=medium
 
   * Use --try-or-install in the systemd unit of the new desktop installer,
diff -Nru casper-1.480/scripts/casper casper-1.480ubuntu1~dviererbe/scripts/casper
--- casper-1.480/scripts/casper	2022-11-08 00:29:36.000000000 +0200
+++ casper-1.480ubuntu1~dviererbe/scripts/casper	2023-02-20 20:53:22.000000000 +0200
@@ -383,14 +383,17 @@
             desktop_url=http://cdimage.ubuntu.com/daily-live/current/$UBUNTU_CODENAME-desktop-$DPKG_ARCH.iso
             ;;
         *)
+            # parses the version id with dot release number for LTS versions 
+            # (e.g. '22.04.1' instead of '22.04')
+            full_version_id="$(echo "$VERSION"| grep -o -s -E '^[0-9\.]+')"
             case $DPKG_ARCH in
                 amd64)
-                    server_url=https://releases.ubuntu.com/$UBUNTU_CODENAME/ubuntu-$VERSION_ID-live-server-$DPKG_ARCH.iso
-                    desktop_url=https://releases.ubuntu.com/$UBUNTU_CODENAME/ubuntu-$VERSION_ID-desktop-$DPKG_ARCH.iso
+                    server_url=https://releases.ubuntu.com/$UBUNTU_CODENAME/ubuntu-$full_version_id-live-server-$DPKG_ARCH.iso
+                    desktop_url=https://releases.ubuntu.com/$UBUNTU_CODENAME/ubuntu-$full_version_id-desktop-$DPKG_ARCH.iso
                     ;;
                 *)
-                    server_url=http://cdimage.ubuntu.com/releases/$UBUNTU_CODENAME/release/ubuntu-$VERSION_ID-live-server-$DPKG_ARCH.iso
-                    desktop_url=http://cdimage.ubuntu.com/releases/$UBUNTU_CODENAME/release/ubuntu-$VERSION_ID-desktop-$DPKG_ARCH.iso
+                    server_url=http://cdimage.ubuntu.com/releases/$UBUNTU_CODENAME/release/ubuntu-$full_version_id-live-server-$DPKG_ARCH.iso
+                    desktop_url=http://cdimage.ubuntu.com/releases/$UBUNTU_CODENAME/release/ubuntu-$full_version_id-desktop-$DPKG_ARCH.iso
                     ;;
             esac
             ;;