A.R.NARESH, thank you for reporting this and helping make Ubuntu better. As per https://wiki.ubuntu.com/Releases 13.04 is EOL.
If you have an issue in a supported release (ex. 16.04) please file a new report, and feel free to subscribe me to it. ** Changed in: xserver-xorg-video-nouveau (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-nouveau in Ubuntu. https://bugs.launchpad.net/bugs/1174442 Title: failed to start the system To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/1174442/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp