Failed to start Verify integrity of password and group files.

Fix it by running pwck.

x220:~$ sudo pwck
user 'umurmur': directory '/home/umurmur' does not exist
pwck: no changes
x220:~$ pacman -Ss umurmur
community/umurmur 0.2.14-1
	Minimalistic Mumble server
x220:~$ sudo vim /etc/passwd
x220:~$ sudo pwck
no matching password file entry in /etc/passwd
delete line 'umurmur:!:16094::::::'? yes
pwck: the files have been updated