# Ubuntu – Can’t use nvidia after upgrading kernel

18.04kernelnvidia-primenvidia-settings

If I use the kernel that came with ubuntu 18.04 after a fresh-install, I can use the nvidia GPU.

However, after using ukuu to install kernel 4.17.2 I can't use the nvidia GPU anymore.

lucas@test:/boot$uname -a Linux test 4.17.2-041702-generic #201806160433 SMP Sat Jun 16 08:35:37 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux lucas@test:~$ prime-select query
nvidia

lucas@test:~$glxinfo|egrep "OpenGL vendor|OpenGL renderer" OpenGL vendor string: Intel Open Source Technology Center OpenGL renderer string: Mesa DRI Intel(R) Haswell Mobile  When running nvidia-settings I get to see: ERROR: NVIDIA driver is not loaded ERROR: Error querying enabled displays on GPU 0 (Missing Extension). ERROR: Error querying connected displays on GPU 0 (Missing Extension). ** Message: 20:49:20.826: PRIME: Requires offloading ** Message: 20:49:20.826: PRIME: is it supported? yes ERROR: nvidia-settings could not find the registry key file. This file should have been installed along with this driver at /usr/share/nvidia/nvidia-application-profiles-key-documentation. The application profiles will continue to work, but values cannot be prepopulated or validated, and will not be listed in the help text. Please see the README for possible values and descriptions.  Interestingly, there is no /usr/share/nvidia/nvidia-application-profiles-key-documentation but a nvidia-application-profiles-390.48-key-documentation. lucas@test:/usr/share/nvidia$ ls -l
total 16
-rw-r--r-- 1 root root 6041 mar 22 03:47 nvidia-application-profiles-390.48-key-documentation
-rw-r--r-- 1 root root 6052 mar 22 03:47 nvidia-application-profiles-390.48-rc


Everything is solved if -at boot time- I go choose kernel 4.15.0-22.generic, which is the kernel that came with the fresh install.

What can I do?

Thanks!