Explicitly depend on lubuntu-installer-prompt, which provides a default workflow on the live system. Remove this package at the end of the install as well.

debian/changelog

@@ -2,6 +2,9 @@ calamares-settings-ubuntu (1:24.04.8) UNRELEASED; urgency=medium
 
   * Use lxqt-sudo instead of sudo, to pick up theming.
   * Even if modules fail, try to perform the unmount.
+  * Explicitly depend on lubuntu-installer-prompt, which provides a default
+    workflow on the live system. Remove this package at the end of the install
+    as well.
 
  -- Simon Quigley <tsimonq2@ubuntu.com>  Wed, 22 Nov 2023 15:22:22 -0600
 

debian/control

@@ -25,6 +25,7 @@ Package: calamares-settings-lubuntu
 Architecture: all
 Depends: calamares-settings-ubuntu-common (>= ${binary:Version}),
          ${misc:Depends}
+Recommends: lubuntu-installer-prompt
 Conflicts: calamares-settings-ubuntustudio
 Description: Lubuntu Calamares Settings and Branding
  This package contains the Calamares settings and branding for Lubuntu.

lubuntu/modules/packages.conf

@@ -7,6 +7,7 @@ operations:
       - calamares
       - zram-config
       - cifs-utils
+      - lubuntu-installer-prompt
   - try_install:
       - language-pack-$LOCALE
       - language-pack-gnome-$LOCALE