Arch Linux

Description:
During installation (and upgrade), a user and group xmms2 are created. These are not deleted during uninstall, which results in failed state of shadow.service (started automatically every day by systemd timer).

Additional info:
Excerpt from journalctl during installation:
[code]
groupadd[1263]: group added to /etc/group: name=xmms2, GID=46
groupadd[1263]: group added to /etc/gshadow: name=xmms2
groupadd[1263]: new group: name=xmms2, GID=46
useradd[1268]: new user: name=xmms2, UID=46, GID=46, home=/var/lib/xmms2, shell=/bin/false
useradd[1268]: add 'xmms2' to group 'audio'
useradd[1268]: add 'xmms2' to shadow group 'audio'
[/code]

Status of shadow.service after next run after uninstall:
[code]
● shadow.service - Verify integrity of password and group files
Loaded: loaded (/usr/lib/systemd/system/shadow.service; static; vendor preset: disabled)
Active: failed (Result: exit-code) since Fr 2016-03-11 22:55:06 CET; 13min ago
Process: 1346 ExecStart=/usr/bin/pwck -r (code=exited, status=2)
Main PID: 1346 (code=exited, status=2)

systemd[1]: Starting Verify integrity of password and group files...
pwck[1346]: user 'xmms2': directory '/var/lib/xmms2' does not exist
pwck[1346]: pwck: no changes
systemd[1]: shadow.service: Main process exited, code=exited, status=2/INVALIDARGUMENT
systemd[1]: Failed to start Verify integrity of password and group files.
systemd[1]: shadow.service: Unit entered failed state.
systemd[1]: shadow.service: Failed with result 'exit-code'.
[/code]

Steps to reproduce:
pacman -S xmms2
pacman -R xmms2
systemctl start shadow.service (alternatively: pwck -r)