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update-grub
Tho this command is going to change soon,it might still work.
Might be relevant...
Flash-forward to Karmic Koala, and it recognized my fake-RAID just fine. It even installed on my RAID 0 without a hitch until I rebooted. I could never boot the system entirely (Got a white logo, pressed enter and was stuck at the "initramfs" prompt).
The LiveCD would only recognize the RAID, and wouldn't allow me to install on single drives. The alternate installer CD would allow me to bypass the RAID, but installations on single drives still wouldn't boot. They'd install fine, but not boot. Of course using the alternate installer for software RAIDs wouldn't work either.
In the end, it was the simplest of things...I still had my SATA running in "IDE" mode in my BIOS. I flipped that back to "RAID", and installed again with the LiveCD. Koala saw my RAID once more, installed, and this time booted just fine.
So there is was for me. Koala detected the fake-RAID even though my BIOS wasn't set to use it. I know more than a few PCs with SATA drives that are set to IDE mode rather than RAID mode...especially computers with single drives only. Fake-RAIDs are becoming more and more commonplace since SATA became popular. If you have boot issues with Karmic, take a look at your BIOS and see if you can't configure your SATA devices differently.
I've seen crazier things happening before...
Also make sure
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fdisk -l