Install system-wide ruby:
sudo apt-get install ruby
Add this lines to ~/.local/share/applications/mimeapps.list
in Added Associations
section:
x-scheme-handler/subl=subl-uri.desktop
x-scheme-handler/txmt=txmt-uri.desktop
or run
xdg-mime default subl-uri.desktop x-scheme-handler/subl
xdg-mime default txmt-uri.desktop x-scheme-handler/txmt
After run:
sudo update-desktop-database