I tried removing a file. The most relevant answer can be found here, but I found no luck. Here is the original problem:
maxgitt@mgpc:~$ sudo rm -rf /var/lib/docker/ rm: cannot remove '/var/lib/docker/aufs': Device or resource busy
To locate the process I tried the following:
maxgitt@mgpc:~$ sudo lsof +D /var/lib/docker/ lsof: WARNING: can't stat() fuse.gvfsd-fuse file system /run/user/1000/gvfs Output information may be incomplete.
So I tried found in a comment in the above answer but found nothing,
maxgitt@mgpc:~$ /sbin/fuser -m /var/lib/docker/ bash: /sbin/fuser: No such file or directory
ps couldn't find the process
maxgitt@mgpc:~$ ps aux | grep docker maxgitt 5349 0.0 0.0 14224 1024 pts/18 S+ 15:21 0:00 grep --color=auto docker maxgitt@mgpc:~$
Any help on how to kill this mysterious process would be great.