After a computer reboot last week, my Ubuntu 18.04 LTS system had suddenly forgotten everything about my monitors and only produced an image for an "Unknown" monitor, so I removed everything having to do with NVIDIA, including CUDA and cuDNN (which I need to run TensorFlow on the GPU), and attempted to reinstall everything from scratch. I successfully reinstalled the GPU drivers and retained my monitor settings.

However, I'm having problems installing CUDA. When I run

sudo apt-get install cuda-toolkit-10-0

I get

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package cuda-toolkit-10-0 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'cuda-toolkit-10-0' has no installation candidate

Which is weird, since I think this is the command I used when installing CUDA before (although I don't remember what finally made CUDA work last time). So I tried to find the package that refers to cuda-toolkit-10-0 by running

apt-cache search cuda-toolkit-10-0

but this doesn't output anything (which is also weird, if what is stated in the linked question is correct).

I've also tried to start from NVIDIA's CUDA Toolkit archive page and follow the instructions for installing a local deb file:

$ sudo dpkg -i cuda-repo-ubuntu1804-10-0-local-10.0.130-410.48_1.0-1_amd64.deb
[sudo] password for kristofer: 
(Reading database ... 249237 files and directories currently installed.)
Preparing to unpack cuda-repo-ubuntu1804-10-0-local-10.0.130-410.48_1.0-1_amd64.deb ...
Unpacking cuda-repo-ubuntu1804-10-0-local-10.0.130-410.48 (1.0-1) over (1.0-1) ...
Setting up cuda-repo-ubuntu1804-10-0-local-10.0.130-410.48 (1.0-1) ...
$ sudo apt-key add /var/cuda-repo-10-0-local-10.0.130-410.48/7fa2af80.pub
$ sudo apt-get update
Hit:1 http://se.archive.ubuntu.com/ubuntu bionic InRelease
Hit:2 http://linux.teamviewer.com/deb stable InRelease                                                                                       
Hit:3 http://se.archive.ubuntu.com/ubuntu bionic-updates InRelease                                                                           
Hit:4 http://se.archive.ubuntu.com/ubuntu bionic-backports InRelease                                                                         
Hit:5 http://security.ubuntu.com/ubuntu bionic-security InRelease                                                                            
Hit:6 http://ppa.launchpad.net/jonathonf/gcc-7.3/ubuntu bionic InRelease                                                                     
Hit:7 http://archive.ubuntu.com/ubuntu bionic InRelease                                                                                      
Hit:8 http://repository.spotify.com stable InRelease                                                                                         
Hit:9 http://archive.canonical.com/ubuntu bionic InRelease                                                                                   
Hit:10 https://packagecloud.io/slacktechnologies/slack/debian jessie InRelease                                             
Reading package lists... Done
$ sudo apt-get install cuda
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package cuda

so apt-get cannot find the package cuda.

So, how do install CUDA 10.0?


I managed to solve it, and here is what worked for me:

  1. Follow the pre-installation actions
  2. Follow the instructions for installing a local runfile
  3. Follow the post-installation actions

In my case, I had already added

export LD_LIBRARY_PATH=/usr/local/cuda-10.1/lib64\

to my bashrc. However, what I didn't realize was that this path name contained the wrong CUDA version number, as I'm not using the latest CUDA version. This is what made TensorFlow unable to find CUDA on my system.

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