Comment 76 for bug 2034986

I have verified the XDG_CURRENT_DESKTOP fix using ubuntu-release-upgrader-core 1:22.04.18 from jammy-proposed:

nr@clean-jammy-amd64:~$ apt policy ubuntu-release-upgrader-core
ubuntu-release-upgrader-core:
  Installed: 1:22.04.18
  Candidate: 1:22.04.18
  Version table:
 *** 1:22.04.18 500
        500 http://archive.ubuntu.com/ubuntu jammy-proposed/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu jammy-proposed/main i386 Packages
        100 /var/lib/dpkg/status
     1:22.04.17 500
        500 http://archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu jammy-updates/main i386 Packages
     1:22.04.10 500
        500 http://archive.ubuntu.com/ubuntu jammy/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu jammy/main i386 Packages
nr@clean-jammy-amd64:~$ do-release-upgrade -f DistUpgradeViewGtk3
Checking for a new Ubuntu release
localuser:root being added to access control list
Checking for a new Ubuntu release
libEGL warning: pci id for fd 48: 1b36:0100, driver (null)

libEGL warning: pci id for fd 13: 1b36:0100, driver (null)

authenticate 'mantic.tar.gz' against 'mantic.tar.gz.gpg'
extracting 'mantic.tar.gz'
[ ... left running in another window ... ]
nr@clean-jammy-amd64:~$ ps aux | grep mantic
root 12099 13.4 22.2 662444 216644 pts/0 Rl+ 12:06 0:10 /usr/bin/python3 -s /tmp/ubuntu-release-upgrader-kb757df9/mantic --mode=server --frontend=DistUpgradeViewGtk3
nr 14227 0.0 0.2 9080 2560 pts/2 S+ 12:07 0:00 grep --color=auto mantic
nr@clean-jammy-amd64:~$ sudo xargs -0 -L1 -a /proc/12099/environ | grep XDG_CURRENT_DESKTOP
XDG_CURRENT_DESKTOP=ubuntu:GNOME