Solved !
As Alexandre Moraes. I remove the xserver-xorg-video-nouveau package then the upgrade works, from Ubuntu 14.04 using i3wm.
Full set of commands: $ apt-get remove --purge xserver-xorg-video-nouveau $ apt-get autoremove $ apt-get autoclean $ apt-get update $ do-release-upgrade
Best regards!
Solved !
As Alexandre Moraes. xorg-video- nouveau package then the upgrade works, from Ubuntu 14.04 using i3wm.
I remove the xserver-
Full set of commands: xorg-video- nouveau
$ apt-get remove --purge xserver-
$ apt-get autoremove
$ apt-get autoclean
$ apt-get update
$ do-release-upgrade
Best regards!