As I could detect in the logfiles, the driver is installed but not in usage:
xorg:nvidia_173 - Beschleunigter Grafiktreiber von NVIDIA (Proprietär, Deaktiviert, Nicht in Benutzung) xorg:nvidia_current - Beschleunigter Grafiktreiber von NVIDIA (Proprietär, Aktiviert, Nicht in Benutzung) translated: xorg:nvidia_173 - accelerated graphic driver from NVIDIA (Proprietaery, not activated, not in usage) xorg:nvidia_current - accelerated graphic driver from NVIDIA (Proprietaery, not activated, not in usage) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/796139 Title: System freezes during usage after installed nvidia driver To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/796139/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs