I guess it is a problem of xorg, because after crash I get error messages that Xorg had crash the next I login.
** Package changed: ubuntu => xorg-server (Ubuntu) -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1574675 Title: System crashes after login Status in xorg-server package in Ubuntu: New Bug description: I'm experiencing a strange problem on a freshly installed 16.04 Lubuntu (64bit). I could not yet localize the problem with debugging, therefore it's difficult to assign it to a particular package. For some reason the screen get's black and dead in an early state of the login process, but it seems to be rather a coincidence and some network/timing problem. The problem does not occur, if I boot the machine in maintenance mode, just take care to have the network up and running, and then proceed. Smells like some timing problem with the boot process (our DHCP server has a significant delay due to our switching infrastructure). 1) Freshly installed 16.04 Lubuntu. Worked without problems. 2) ran puppet to install a big heap of regular packages, applications, etc. and then ran into the problem, that after entering the password in the login screen the machine showed the desktop background image for just about a second, then the screen turned black, the monitor noticed loss of signal, and the machine hung. Needed reboot. Reproducable, happend every time, even in the guest account. I tried to strace the lightdm session (and hoped to find the output after reboot), but did not get that far in the progress of the session to find any useful hints. 3) I therefore bootet into the maintenance root shell in order to connect a second machine as a debugging terminal over the network, but Network Manager did not have managed to get the network up. I removed NM and configured /etc/network/interfaces the old fashioned way. Then found, that the package ubuntu-fan keeps network configuration from suceeding, because it always fails. Removed ubuntu-fan, and network worked well. To my surprise, the desktop then worked without problems *once*. 4) If I boot the machine now, it crashes even earlier, bevor logging in, but not if I have the maintenance Session before. So my guess is that something in the session goes terribly wrong if and only if the network is not properly up in running. Sorry for not beeing more precise, I'll mention as soon as I find more. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1574675/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
