Public bug reported:
Reported by end-users and verified by myself
ubuntu budgie 24.04.4 & ubuntu budgie 25.10
Ubuntu Budgie users who have previously performed a minimal install via
the installer minimal option are left at a TTY after reboot post
upgrade.
If the user examines the list of packages to be cleaned up this includes
the critical packages sddm and budgie-sddm-theme.
For ubuntu budgie we have moved from lightdm and sddm - lightdm is no
longer part of our seeds.
sddm and budgie-sddm-theme (the sddm greeter) are recommendations in the
theme.
----
debugging - I have experimented in stonking making sddm and budgie-sddm-
theme dependencies rather than recommendations. I switched from sddm to
lightdm in 26.04 before the upgrade, purged sddm & budgie-sddm-theme and
apt-mark lightdm as auto - i.e. trying to reproduce the conditions on
24.04 and 25.10.
On a do-release-upgrade -d I can see that sddm and budgie-sddm-theme are
processed as part of the seed installs, lightdm is processed afterwards
as part of the do-release-upgrade package cleanup. This means I can't
use a postinst in budgie-sddm-theme to make systemctl enable sddm.
It appears lightdm removal leaves sddm disabled - /etc/X11/default-
display-manager is indeed equal to the value "/usr/bin/sddm" after
lightdm removal. There is no /etc/systemd/system/display-
manager.service file, so lightdm removal is doing something funky?
----
on matrix skia mentioned possibly using a quirk - but I have no
experience of this and wouldn't know which section would be appropriate
nor how to test - also I'm guessing both 24.04 and 25.10 upgrade-
release-upgrader needs to be updated?
Marking this as critical since the end-user are left with an unusuable
post release upgrade.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: ubuntu-release-upgrader-core 1:26.04.18
ProcVersionSignature: Ubuntu 7.0.0-22.22-generic 7.0.0
Uname: Linux 7.0.0-22-generic x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
CasperMD5CheckMismatches: ./boot/grub/i386-pc/eltorito.img
CasperMD5CheckResult: fail
CrashDB: ubuntu
CurrentDesktop: Budgie
Date: Sun Jun 14 20:39:02 2026
InstallationDate: Installed on 2026-04-05 (70 days ago)
InstallationMedia: Ubuntu-Budgie 26.04 "Resolute Raccoon" - Daily amd64
(20260402)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: ubuntu-release-upgrader
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Critical
Status: New
** Tags: amd64 apport-bug dist-upgrade resolute wayland-session
** Changed in: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided => Critical
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https://bugs.launchpad.net/bugs/2156727
Title:
upgrade from 24.04/25.10 leaves the user at a TTY
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