Have this problem too, since I updated from 15.10 to 16.04. Synaptic is not running, but the lock -file is still there:
randolf@ART-LT16:~$ ps aux | grep synaptic randolf 14314 0.0 0.0 15796 1024 pts/4 S+ 10:47 0:00 grep --color=auto synaptic randolf@ART-LT16:~$ ll /var/cache/apt/archives/lock -rw-r----- 1 root root 0 Okt 21 2015 /var/cache/apt/archives/lock
Hope this helps, randolf
Have this problem too, since I updated from 15.10 to 16.04.
Synaptic is not running, but the lock -file is still there:
randolf@ART-LT16:~$ ps aux | grep synaptic apt/archives/ lock apt/archives/ lock
randolf 14314 0.0 0.0 15796 1024 pts/4 S+ 10:47 0:00 grep --color=auto synaptic
randolf@ART-LT16:~$ ll /var/cache/
-rw-r----- 1 root root 0 Okt 21 2015 /var/cache/
Hope this helps, randolf