Drop references to mythbuntu, obsolete after xenial.

debian/changelog

@@ -10,6 +10,7 @@ livecd-rootfs (23.10.33) UNRELEASED; urgency=medium
     packages.
   * live-build/auto/config: various refactors to eliminate code duplication
   * Drop references to ubuntu-dvd, obsolete since precise.
+  * Drop references to mythbuntu, obsolete after xenial.
 
  -- Steve Langasek <steve.langasek@ubuntu.com>  Wed, 06 Sep 2023 11:23:17 -0700
 

debian/tests/default-bootstraps

@@ -18,7 +18,6 @@ ALL_TRIPLETS="
  kubuntu-dvd::
  lubuntu::
  ubuntu-unity::
- mythbuntu::
  ubuntu::
  ubuntu:legacy:
  ubuntu-base::

live-build/auto/config

@@ -656,7 +656,7 @@ case $PROJECT in
 	edubuntu|kubuntu|kubuntu-dvd|ubuntu-budgie|ubuntu-gnome|ubuntucinnamon|ubuntukylin)
 		COMPONENTS='main restricted universe'
 		;;
-	lubuntu|mythbuntu|ubuntu-mate|ubuntu-unity|ubuntustudio-dvd|xubuntu)
+	lubuntu|ubuntu-mate|ubuntu-unity|ubuntustudio-dvd|xubuntu)
 		COMPONENTS='main restricted universe multiverse'
 		;;
 esac
@@ -820,11 +820,6 @@ case $PROJECT in
 		esac
 		;;
 
-	mythbuntu)
-		add_task install minimal standard mythbuntu-desktop
-		LIVE_TASK='mythbuntu-live'
-		;;
-
 	lubuntu)
 		add_task install minimal standard lubuntu-desktop
 		LIVE_TASK='lubuntu-live'