[Error] distrobox-enter fails with newer ubuntu images

[Kamorst]

Describe the bug
Setting up existing user... phase of distrobox-enter fails on images of ubuntu which has ubuntu as default non-root user (eg: -i ubuntu:25.10 or -i ubuntu:24.04). To see more.

To Reproduce
distrobox-ephemeral -H $(mktemp -d) -i ubuntu:25.10

Expected behavior
distrobox enter normally.

Logs
distrobox.log
More importantly:

distrobox: Setting up existing user...
+ usermod --home /tmp/tmp.cFrICY1IHn --shell /usr/bin/bash --groups sudo --gid 1000 ubuntu
+ [ ubuntu != psato ]
+ usermod --login psato ubuntu
+ getent passwd ubuntu
+ cut -d: -f3
+ [  != 1000 ]
+ usermod --uid 1000 ubuntu
usermod: user 'ubuntu' does not exist

Desktop (please complete the following information):

• Are you using podman, docker or lilipod? podman
• Which version or podman, docker or lilipod? 5.7.1
• Which version of distrobox? 1.8.2.3
• Which host distribution? Fedora 43
• How did you install distrobox? git clone and ./install

Additional context
Reverting the commit 9867e17 makes the problem go away.

After reverting the above commit and entering a ubuntu image, the group of gid 1000 is set to ubuntu instead of my user name which I think is not the expected behavior.