All of these packages (due to dependency issues) have prevented users from installing PR1.2.. Remove them, and reinstall after:

(usually due to a webkit or opengles dependency problem)

gltron
tux racer
teeworld
brainparty
freoffice
openarena
countdowntimer
wikihow

could try that?

I had little over 40 meg free when I upgraded.. a friend had 55.. and couldn't.. I asked him to uninstall gltron and voila.. he could upgrade