Hi ! It seems it was a problem with my wireless card driver (something like a bad update). It didn't occured anymore since I used ndiswrapper instead of free r818x driver.
Sorry to have posted in the wrong area. -- Thunderbird freezes the computer when sending big messages https://launchpad.net/bugs/81115 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
