What language is your computer set to? Is it set to German, Dutch or Italian? Is it one of those sub-languages like "nl-??"?
It's trying to load a translation and failing. You could delete the locale directory that came with bitcoin so it doesn't try to use it.
Can someone test each language on Ubuntu and see if there's a problem with just one of them or maybe all three?
BitcoinTalk
Re: Error on Ubuntu 10.04
From:
satoshi
Subject:
Re: Error on Ubuntu 10.04
Date: