Regarding my last recommendation for Ubuntu and Keepass, there is now a much simpler option: a ppa-repository. Installation now only requires 3 commands, and no fiddling with setting up a script to launch the .exe-file with mono.

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sudo apt-add-repository ppa:jtaylor/keepass
sudo apt-get update
sudo apt-get install keepass2

Alt+F2, keepass2, Enter, and be on your way. In my experience, this also much more stable than running Keepass with mono. This is quite old news and more accessible than my last post on the matter, as this information is linked to from the main Keepass site.