fangorn
November 7th, 2009, 10:11 AM
Hi,
I had a nicely running machine with Intrepid (mythbuntu machine). Yesterday I tried upgrading. First I did a dist-upgrade to jaunty, which went fine. Then I wanted to upgrade to karmic, but configuration of udev failed and hosed my machine.
I had made a backup and tried restoring it in a parallel logical volume, but grub (0.9.x) failed to install into the MBR.
The setup is as follows
/dev/sda1 /boot
/dev/sda2 Extended Partition
/dev/sda5 Encrypted Volume containing LVM
/dev/sdb Hardware RAID5 with LVM signature
Grub now complains that /dev/sdb has no valid partition table. Sure it hasn't. It is not allowed to have one!
As there is - AFAIK - no way to make a fresh install into an existing encrypted LVM, I started my GRML USB token and did a debootstrap karmic amd64 install to the designated root device. Then I mounted the /boot device and the necessary pseudofilesystems and chrooted into the base install. I installed the needed packages using aptitude, including grub-pc (which is reported to support lvm partition tables).
I checked multiple times that the kernel and a grub config is available, I did grub-install multiple times, each and every time reporting no errors. But when I rebooted, I did not see a Grub Splashscreen to select kernel to boot (minor issue) and boot process stopped with
"Giving up waiting for root device /dev/mapper/main-root"
In the console /dev/mapper is empty besides control file. So I think the initial Ramdisk is not correct and does not call cryptsetup and after that start LVM.
Long story short: Now my questions.
How do I get the machine to boot? Is there a way to use Alternate or Desktop Installation CD and recover this installation? Or what sequence of commands is needed when chrooted from a LIVE CD such as GRML?
fangorn
PS: Thanks for reading all this rant. It had to be said. Now I feel better. ;)
I had a nicely running machine with Intrepid (mythbuntu machine). Yesterday I tried upgrading. First I did a dist-upgrade to jaunty, which went fine. Then I wanted to upgrade to karmic, but configuration of udev failed and hosed my machine.
I had made a backup and tried restoring it in a parallel logical volume, but grub (0.9.x) failed to install into the MBR.
The setup is as follows
/dev/sda1 /boot
/dev/sda2 Extended Partition
/dev/sda5 Encrypted Volume containing LVM
/dev/sdb Hardware RAID5 with LVM signature
Grub now complains that /dev/sdb has no valid partition table. Sure it hasn't. It is not allowed to have one!
As there is - AFAIK - no way to make a fresh install into an existing encrypted LVM, I started my GRML USB token and did a debootstrap karmic amd64 install to the designated root device. Then I mounted the /boot device and the necessary pseudofilesystems and chrooted into the base install. I installed the needed packages using aptitude, including grub-pc (which is reported to support lvm partition tables).
I checked multiple times that the kernel and a grub config is available, I did grub-install multiple times, each and every time reporting no errors. But when I rebooted, I did not see a Grub Splashscreen to select kernel to boot (minor issue) and boot process stopped with
"Giving up waiting for root device /dev/mapper/main-root"
In the console /dev/mapper is empty besides control file. So I think the initial Ramdisk is not correct and does not call cryptsetup and after that start LVM.
Long story short: Now my questions.
How do I get the machine to boot? Is there a way to use Alternate or Desktop Installation CD and recover this installation? Or what sequence of commands is needed when chrooted from a LIVE CD such as GRML?
fangorn
PS: Thanks for reading all this rant. It had to be said. Now I feel better. ;)