I think I've the same problem. Updated yesterday, started my computer this morning and after the boot screen I'm only seeing a blinking cursor on a black screen. Tought it had something todo with lightdm, but nothing I tried fixed it.
After that I've removed all nvidia packages: sudo apt-get purge nvidia-* Rebooted, and choose the nvidia-331-updates driver I was using before (via Additional Drivers). This gave the blinking cursor again. So I've tried the other drivers (nvidia-331, nvidia-304, nvidia-304-updates), but none of these installed correctly. After every reboot I got the failsafe mode from Xorg. I've also tried to downgrade nvidia-common to 1:0.2.91.4, but this again caused to fallback in the failsafe mode. Ps. I'm also missing the nvidia-xconfig command, used it a few days ago. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to nvidia-common in Ubuntu. https://bugs.launchpad.net/bugs/1371828 Title: After updating nvidia-common to 1:0.2.91.7, nvidia drivers are no longer in use Status in “nvidia-common” package in Ubuntu: Confirmed Bug description: 1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> About Ubuntu Description: Ubuntu 14.04.1 LTS Release: 14.04 2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in Software Center nvidia-common: Installed: 1:0.2.91.7 Candidate: 1:0.2.91.7 Version table: *** 1:0.2.91.7 0 500 http://my-mirror/archive-ubuntu/ubuntu/ trusty-updates/universe amd64 Packages 100 /var/lib/dpkg/status 1:0.2.91.4 0 500 http://my-mirror/archive-ubuntu/ubuntu/ trusty/universe amd64 Packages 3) What you expected to happen nVidia binary drivers are used 4) What happened instead nouveau Xorg driver is used, but the nVidia kernel module is loaded. I updated this package yesterday but did not reboot. When I started my machine this morning I could only boot into the terminal. Xorg.0.log said that the nvidia module did no exist. After purging the nvidia driver and reinstalling, I can now start the machine and get into X, but the nouveau driver X driver is in use. ldmod shows the nvidia driver loaded: ... ppdev 17671 0 nvidia 10675249 0 snd_hda_codec_hdmi 46368 1 ... But Xorg.0.log says the Xorg driver could not be found: [ 9.730] (II) LoadModule: "nvidia" [ 9.731] (WW) Warning, couldn't open module nvidia [ 9.731] (II) UnloadModule: "nvidia" [ 9.731] (II) Unloading nvidia [ 9.731] (EE) Failed to load module "nvidia" (module does not exist, 0) The Driver Manager says that I am using the nvidia driver version 331.38, but update-alternatives has the MESA ld.so.conf selected: $ sudo update-alternatives --config x86_64-linux-gnu_gl_conf There are 3 choices for the alternative x86_64-linux-gnu_gl_conf (providing /etc/ld.so.conf.d/x86_64-linux-gnu_GL.conf). Selection Path Priority Status ------------------------------------------------------------ 0 /usr/lib/nvidia-331/ld.so.conf 8604 auto mode 1 /usr/lib/nvidia-331-prime/ld.so.conf 8603 manual mode 2 /usr/lib/nvidia-331/ld.so.conf 8604 manual mode * 3 /usr/lib/x86_64-linux-gnu/mesa/ld.so.conf 500 manual mode If I select 0 and log out and back in, the nvidia driver is in use, but I cannot start Steam. This select also does not survive a reboot. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-common/+bug/1371828/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
