Re: Permission restrictions
From the sounds of it your user received a different uid from when you installed Ubuntu the first time. Usually this happens if you had more than one user in the previous install and you created the users in the reinstall in a different order. I'm assuming of course that you did a reinstall with preservation of your /home partition.
Never upgrade your working system to the newest release without thorough testing on the actual hardware you will be running it on.
Never perform a system update in a live session
Installed Ubuntu Touch 1.0 on my Nexus 7. And loving it!