I'm following the instructions on https://wiki.ubuntu.com/Nexus7/Installation using the desktop installer to get Ubuntu on to my nexus 7, but it gets stuck on first boot on 'Applying changes' > Noting disappearance of ubiquity. When I click on 'Details' it's stuck on 'Purging configuration files for ubiquity ...'. It's sat there for an hour so far.
I have switched usb cable and reinstalled stock android (successfully) and tried again as suggested on the wiki page.
I have also tried the manual installing instructions and get a FAILED (remote: (InvalidSize)) error.
Any ideas where i'm doing wrong?