I ran into an Upgrade Snag when going from Ubuntu 8.10 to 9.04 I Googled " Old Alarms preventing logging in to Ubuntu " and found this:
Bug #321176 in alarm-clock (Ubuntu Jaunty): “[Jaunty] alarm-clock causes screen to freeze” after upgrade.
I'd like to (need to) file or confirm a proper bug report on this. But as I'm pressed for time, I promised the son some Sub-Urban Golf today, I'm going to post this here, and if someone comments, or finds this useful cool. That's why I did it.
(note to self, DO get learned on proper bug-report filing, soon)
I ran into a problem using the upgrade button on my secondary laptop, I was going from 8.10 -> 9.04 Jaunty. I had a utility on the computer called Alarm Clock, Also know as Alarm-Clock. My computer went through the proper upgrade without a hitch, but this utility cause my machine to freeze while booting. With little work or though, I found that from the GRUB menu I could boot into:
Ubuntu 9.04 kernel 2.6.28-11-generic (recovery mode)
Pick Root [drop to shell prompt]
From this Shell Terminal do a:
Apt-get remove alarm-clock
Exit back out and boot into my System
All things back to normal, minus the Alarm Clock on the panel.