I'm not a guru, but I know my way around the command line.
The other day I had just finished setting up an mdadm soft raid-0 configuration on two 2 TB wd green storage drives (system is installed on another drive). I thought I had everything working correctly. Then yesterday I go to install the software center updates. The new kernel, 3.2.0-40 is installed. Now when I reboot, it freezes on a purple screen. When I did a reboot from that, it complains that my raid-0 is degraded. I chose the option to boot with degraded raid.
Now every time I restart, if I let it use kernel 3.2.0-40 I get stuck at an empty purple screen. If I instead use grub to load the previous kernel, 3.2.0-39 It boots normally, although it seems my raid is permanently in a degraded state (with only 1 of 2 drives) until I do something about it.
Please help. Primary concern right now is getting a clean boot.