$ sudo apt-get install -f
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0B of additional disk space will be used.
Setting up timidity-daemon (2.13.2-39build1) ...
Adding system user timidity....done
groups: timidity: No such user
adduser: The user `timidity' does not exist.
dpkg: error processing timidity-daemon (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 timidity-daemon
E: Sub-process /usr/bin/dpkg returned an error code (1)