I think, this was because I used python 2.6 with 'update-alernative' and so, I'll try to upgrade with python-2.7 and update the ticket as well.
** Changed in: gwibber (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/775558 Title: package gwibber-service 3.0.0.1-0ubuntu2 failed to install/upgrade: le sous-processus nouveau script pre-removal a retourné une erreur de sortie d'état 1 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs