I had a similar problem with 4 drives, the last being an external USB hard drive. Under Jaunty it is named sdd (by os-prober) while under Karmic it is named sdh (again using os-prober); however, the device.map for Karmic still lists it as sdd. Whenever I run update-grub I get all the same "cannot open `/dev/sdd' ..."errors and later get a grub probe error "Cannot find a GRUB drive for /dev/sdh3. check your device map". I changed device.map under Karmic to sdh (for grub drive hd3) and ran update-grub without errors. The second install of Karmic on sdh also booted.
-- error: cannot open `/dev/sdb' while attempting to get disk size - grub2 update https://bugs.launchpad.net/bugs/425112 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-b...@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs -- universe-bugs mailing list universe-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/universe-bugs