Upgrading from Trisquel 6.1 to 7 failed with errors and now laptop gets stuck in bootloading phase

Hi,

I finally got around to upgrade from Trisquel 6.1 to 7. I backed up my entire home folder, updated, 'safe-upgraded', cleaned and autocleaned using aptitude my 6.1 install. I also re-booted my machine to use the latest kernel (3.2.0-93-generic if I remember correctly) that was installed with that last upgrade. I then proceeded to upgrade to Trisquel 7 (via tty1) by executing 'do-release-upgrade' as recommended. Strangely, I was not prompted to run as sudo which I would have expected. Anyway, the upgrade appeared to progress as expected yet when it finally 'finished' there were messages stating that their were errors with the upgrade. I assumed due to these errors (whatever their cause) my system would remain on 6.1. Now, I'm in the situation where my machine starts to boot up, attempts to load the OS but then hangs at some point in the process with the screen displaying some startup messages but flashing making it difficult to read what they say.

I should state my machine is a Libreboot X60 but at this point I've no reason to suspect the bootloader. Has anyone experienced such an issue during a similar trisquel upgrade? Any help/advice would be greatly appreciated.