Unable to restore Envince as default pdf viewer
Solution 1:
You don't need to delete the file and lose all the associations. You could just remove the lines that associate PDF to imagemagick. I just removed the following lines from ~/.config/mimeapps.list, and it worked!
image/pdf=display-im6.desktop
image/pdf=display-im6.q16.desktop;display-im6.desktop;
Solution 2:
Ok, I solved the problem:
Rename or delete
~/.config/mimeapps.list
That's it :-)
If you've set other than default apps for certain filetypes open System Settings > Information > Default Associations and (re)set your favourites there...