After instalation amdgpu-pro the screan doesn't display and i can see only corsour. I found the solution here amdgpu-pro-install on Ubuntu GNOME 16.04 with R9 285 and RX 480 but after exute a command apt-get source cogl there is error:

WARNING: packeting "cogl" is managed in system of control version "Svn" at: svn://svn.debian.org/pkg-gnome/desktop/unstable/cogl It's necessary to download 1652 kB sources archives. WARNING: Some packiets could be not verificated cogl E: Some packiets could be not verificated Sorry my English is not very well. Error code is translated by me.


This is what worked for me:

  1. Log out
  2. Press CTRL+ALT+F6 to get a terminal login
  3. Logged in
  4. apt-get source cogl
  5. Log out by typing logout
  6. Press CTRL+ALT+F7 to return to the graphical login screeen
  7. Login again

Hope this helps

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