Cannot boot into GUI with nvidia-340 installed.
I have a Lenovo Z50-70 laptop (i5/8GB) with Nvidia GeForce graphics card (2GB). When I install the propreitary driver (nvidia-340), the system doesn't boot into the GUI. The only way I can use the system is by changing the boot parameters to "nomodeset" from "quiet splash" and choosing a CLI (Ctrl+Alt+F1). Some relevant info I could think of are listed below along with the commands:
lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.4 LTS
Release: 18.04
Codename: bionic
uname -a
Linux Enigma 4.15.0-109-generic #110-Ubuntu SMP Tue Jun 23 02:39:32 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
grep -i nvidia /var/log/syslog
Jul 3 11:33:51 Enigma gnome-software[
Jul 3 11:39:35 Enigma systemd-udevd[324]: Process '/bin/systemctl start --no-block nvidia-
Jul 3 11:39:35 Enigma systemd-udevd[324]: Process '/bin/systemctl start --no-block nvidia-
Jul 3 11:39:35 Enigma systemd-udevd[324]: Process '/bin/systemctl stop --no-block nvidia-
Jul 3 11:39:35 Enigma kernel: [ 26.479947] nvidia: loading out-of-tree module taints kernel.
Jul 3 11:39:35 Enigma kernel: [ 26.479957] nvidia: module license 'NVIDIA' taints kernel.
Jul 3 11:39:35 Enigma kernel: [ 26.483010] nvidia: module verification failed: signature and/or required key missing - tainting kernel
Jul 3 11:39:35 Enigma kernel: [ 26.487322] nvidia 0000:03:00.0: enabling device (0006 -> 0007)
Jul 3 11:39:35 Enigma kernel: [ 26.487681] [drm] Initialized nvidia-drm 0.0.0 20150116 for 0000:03:00.0 on minor 0
Jul 3 11:39:35 Enigma kernel: [ 26.487685] NVRM: loading NVIDIA UNIX x86_64 Kernel Module 340.108 Wed Dec 11 11:06:58 PST 2019
Jul 3 11:39:35 Enigma kernel: [ 27.065515] nvidia_uvm: Loaded the UVM driver, major device number 242
Jul 3 11:40:03 Enigma systemd-
Jul 3 11:55:56 Enigma nvidia-
Jul 3 12:04:30 Enigma nvidia-
Jul 3 12:10:25 Enigma psensor.
Jul 3 12:25:57 Enigma psensor.
Jul 3 12:57:42 Enigma systemd-udevd[323]: Process '/bin/systemctl start --no-block nvidia-
Jul 3 12:57:42 Enigma systemd-udevd[328]: Process '/bin/systemctl start --no-block nvidia-
Jul 3 12:57:42 Enigma systemd-udevd[325]: Process '/bin/systemctl stop --no-block nvidia-
Jul 3 12:57:42 Enigma kernel: [ 25.311989] nvidia: loading out-of-tree module taints kernel.
Jul 3 12:57:42 Enigma kernel: [ 25.311998] nvidia: module license 'NVIDIA' taints kernel.
Jul 3 12:57:42 Enigma kernel: [ 25.314860] nvidia: module verification failed: signature and/or required key missing - tainting kernel
Jul 3 12:57:42 Enigma kernel: [ 25.319201] nvidia 0000:03:00.0: enabling device (0006 -> 0007)
Jul 3 12:57:42 Enigma kernel: [ 25.319562] [drm] Initialized nvidia-drm 0.0.0 20150116 for 0000:03:00.0 on minor 0
Jul 3 12:57:42 Enigma kernel: [ 25.319566] NVRM: loading NVIDIA UNIX x86_64 Kernel Module 340.108 Wed Dec 11 11:06:58 PST 2019
Jul 3 12:57:42 Enigma kernel: [ 25.797368] nvidia_uvm: Loaded the UVM driver, major device number 242
Jul 3 12:58:06 Enigma systemd-
Jul 3 13:00:53 Enigma systemd-
Jul 3 13:11:11 Enigma systemd-udevd[325]: Process '/bin/systemctl start --no-block nvidia-
Jul 3 13:11:11 Enigma systemd-udevd[320]: Process '/bin/systemctl start --no-block nvidia-
Jul 3 13:11:11 Enigma systemd-udevd[322]: Process '/bin/systemctl stop --no-block nvidia-
Jul 3 13:11:11 Enigma kernel: [ 25.243745] nvidia: loading out-of-tree module taints kernel.
Jul 3 13:11:11 Enigma kernel: [ 25.243755] nvidia: module license 'NVIDIA' taints kernel.
Jul 3 13:11:11 Enigma kernel: [ 25.246930] nvidia: module verification failed: signature and/or required key missing - tainting kernel
Jul 3 13:11:11 Enigma kernel: [ 25.251447] nvidia 0000:03:00.0: enabling device (0006 -> 0007)
Jul 3 13:11:11 Enigma kernel: [ 25.251854] [drm] Initialized nvidia-drm 0.0.0 20150116 for 0000:03:00.0 on minor 0
Jul 3 13:11:11 Enigma kernel: [ 25.251860] NVRM: loading NVIDIA UNIX x86_64 Kernel Module 340.108 Wed Dec 11 11:06:58 PST 2019
Jul 3 13:11:11 Enigma kernel: [ 26.955058] nvidia_uvm: Loaded the UVM driver, major device number 241
Jul 3 13:11:41 Enigma systemd-
Jul 3 13:12:52 Enigma systemd-
Jul 3 13:12:57 Enigma systemd-
Jul 3 13:16:45 Enigma nvidia-
Jul 3 13:17:05 Enigma nvidia-
Jul 3 13:17:05 Enigma nvidia-
Jul 3 13:22:10 Enigma psensor.
grep -i nvidia /etc/modprobe.d/*
/etc/modprobe.
systemctl status nvidia-persistenced
Unit nvidia-
Please note that these outputs were generated after the nvidia-340 driver was purged. Also, I have tried two methods of installing the driver: command line using "sudo apt install nvidia-340" and from the "Additional drivers" tab in "Softwares and Updates". Both result in the same problem. In the output above, the entry "nvidia-
Please help.
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