You probably just need to install the mono-complete package. sudo apt-get install mono-complete
If you have further issues, the Favicon Downloader plugin is not part of the keepass2 Ubuntu package. You should report the issue at https://github.com/luckyrat/KeePass-Favicon-Downloader instead. ** Changed in: keepass2 (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1373587 Title: Plugin Favicon Downloader does not work To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/keepass2/+bug/1373587/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs