I don't know whether this is correct, but I seem to recall that there are multiple places to store fonts, especially with true type stuff, and multiple ways to install them (some I double click, some I copy to folders, etc.).
I don't recall where I would have put mine, or how I would have installed, (did I accidentally sudo install some, but not others? Maybe), so I'm hoping someone can give me a recipe for where I should copy /all/ old 11.10 fonts from, and where I should copy them to on my 12.04 system---including anything I need to be mindful of with permissions, etc.