Thanks Richard Merren. This workaround solved my problem and I can continue to use Geany (still, since the bug remains, many users are possibly abandoning this software).
For other users with the same problem, you can change Editor font following Edit -> Preferences -> Interface and, then, change Fonts: Editor to Liberation Mono Regular -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1872391 Title: underscore not shown in geany editor window To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/geany/+bug/1872391/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs