This is how Thunderbird 24.4 looks in Ubuntu 14.04 (at least in my fresh install). The boxy, windows 95 look, seems like it fails to find the Ambiance theme which is the default for the 14.04 lts. This is also the case with Firefox. The rest of the default application is looking right for now. I downloaded Gnucash yesterday and it also fails to find Ambiance theme.
linux experience, technology, music and film, what kept me up last night