I managed to resolve this problem. Here I will describe the steps and errors I did and/or occurred:
1. I added the NVIDIA drivers PPA: ppa:graphics-drivers/ppa which caused to install a new non- distro free version of my current driver: from 418.56 to 418.67. 2. The new driver version included new dependencies that caused X-Org to crash when trying to use NVIDIA for processing the screen. 3. In addition, the new installation created non-valid "xorg.conf" which caused, again, X-Org crashing when trying to log-in either boot screen. The solution: 1. Remove both NVIDIA drivers PPA and CUDA ones from "sources.list" and/or "sources.list.d". 2. Uninstall both "mesa drivers" and "gstreamer": $ sudo apt remove mesa-va-drivers gstreamer1.0-vaapi [REBOOT] 3. Completely delete "/etc/X11/xorg.conf" which contains invalid configuration. 4. Remove new NVIDIA drivers and libraries in order to install the "older" (but working) ones. $ sudo apt remove --purge nvidia-* $ sudo apt remove --purge libnvidia* $ sudo apt remove --purge *nvidia* $ sudo apt remove --purge *cuda* I removed that all because of new dependencies installed in order to avoid versions' compatibility errors when trying to install the recommended drivers. [REBOOT] 5. Install recommended drivers with: $ sudo ubuntu-drivers autoinstall [REBOOT] 6. Boot again into Ubuntu and log-in normally, checked "nvidia-smi" and got working configuration: $ nvidia-smi Sat Jun 15 17:25:18 2019 +-----------------------------------------------------------------------------+ | NVIDIA-SMI 418.56 Driver Version: 418.56 CUDA Version: 10.1 | |-------------------------------+----------------------+----------------------+ | GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC | | Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. | |===============================+======================+======================| | 0 GeForce GTX 950M Off | 00000000:01:00.0 Off | N/A | | N/A 43C P8 N/A / N/A | 750MiB / 2004MiB | 0% Default | +-------------------------------+----------------------+----------------------+ +-----------------------------------------------------------------------------+ | Processes: GPU Memory | | GPU PID Type Process name Usage | |=============================================================================| | 0 1207 G /usr/lib/xorg/Xorg 24MiB | | 0 1431 G /usr/bin/gnome-shell 48MiB | | 0 1693 G /usr/lib/xorg/Xorg 120MiB | | 0 1878 G /usr/bin/gnome-shell 460MiB | | 0 2137 G /usr/bin/nextcloud 2MiB | | 0 2641 G ...-token=671EE9C10F25860492D3CA477A4C4162 5MiB | | 0 2690 G ...quest-channel-token=4068114528266404073 7MiB | | 0 2702 G ...uest-channel-token=18369271805930189070 33MiB | | 0 3188 G ...quest-channel-token=6098888096153109739 5MiB | | 0 3304 G ...quest-channel-token=5873873380325413621 38MiB | +-----------------------------------------------------------------------------+ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1832935 Title: NVIDIA driver 418.67 - Ubuntu 19.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1832935/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs