I'm kind of new to this, so please stay with me. I have an ubuntu laptop from system 76. I keep it relatively up-to-date, and last night it prompted me to upgrade to 12.04. I started the upgrade and went to sleep. When I woke up, it had finished downloading packages, and looked like it had just started installing. A few hours later, it was in the same place and everything seemed totally locked up. AFter about 3 hours of no movement, I decided to risk a reboot. Well, it didn't go so well.
I've entered some sort of recovery terminal and hope there are some magic commands I can enter to finish the upgrade.
In the meantime I started a download of Ubuntu 12.04 LTS on another computer.
What do I do from here? If I end up needing to use the downloaded installer, how can I finish the upgrade using that? I have some very important files on this computer. Though they are backed up, it would still be a tremendous hassle if I can't access them.
EDIT: If I need to go the use an installer file route, I'm downloading the file on a Mac. Can I just follow the instructions on the website to put it on a flash drive, or since I hope to use it to boot an Ubuntu computer do I need to go about things differently?