I restarted the station, just in case, and it solved the problem.
I guess that some process stuck the whole thing...

Thanks for your help

pgrep for any running deluge processes and kill them.
There was no running process for deluge.

remove deluge lock file ~/.config/deluge/ipc/deluge-gtk.lock
Ok, file removed.

start deluge-gtk from console
Still receiving the same error message :/

Hi everyone. Yesterday, I installed Deluge 1.2.1 from the PPA, but it fails to start, anytime. If I try to launch it through Applications > Internet > Deluge, a window pops in the taskbar telling that it's starting, but eventually it disappears. If I try to launch it through a console, here's the er...