I assume you are attempting to update the browser on the base system partition, correct? If so, I would recommend increasing the size of the base system partition, so that you have a little more room to maneuver. To do this, boot from a current ubermix install key, choose option 5 (Expert) followed by option 3 (Resize) and set your base to 5 gig (which should be plenty). Then apply your updates.
Java is a tricky one, since Canonical no longer distributes the bits. To update:
- Go to http://java.com
- click "Free java download"
- Click "Linux (self extracting file)" to download the update.
Once you have the update, we'll go to the terminal (press ctrl-alt-t to open one) and run a few commands. Enter (or copy and paste) each of the following lines in order:
cd Downloads
chmod +x jre*
./jre*
mv jre1.6* jre
sudo cp -Rv jre /usr/lib/jvm/java-6-sun/
sudo rm /usr/lib/mozilla/plugins/libjavaplugin.so
sudo ln -s /usr/lib/jvm/java-6-sun/jre/lib/i386/libnpjp2.so /usr/lib/mozilla/plugins/libnpjp2.so
Whew! You're done