I run 12.04 on a ASUS laptop that's about 3+ years old, that has a bad battery. (Requires constant AC power.)
I recently did an update that included a kernel. I ran the update and rebooted, and for some reason , grub couldn't find the kernel, and I was stuck there for awhile. Being a relatively inexperienced Linux user, I decided to load my live USB, copy over files I wanted to keep, and reinstall. Mid-copy , I bumped my power cable and unplugged the computer. When I booted back up, it loaded my hard disk install without problem.
Why did this happen in the first place, what fixed it, and how can I avoid this problem in the future?