2.3 -> 3.0 RC2 update failed with grub rescue prompt

Z

ZeroHour

New Member
Jul 27, 2012
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Aberdeen, United Kingdom
Hi
Just attempted a update to 3.0 RC2 and after the install appeared successfully I am left with a grub rescue prompt after rebooting.
I am not sure what I did wrong yet, does anyone have any suggestions/pointers?

Cheers
 
boot with a linux live cd and check the grub config.
 
ZeroHour said:
Its a remote server with hetzner so looking for a minimal livecd as I have to upload it via KVM.

I should also add it stated:
"symbol not found grub_divmod64_full"
Click to expand...

do you have followed the wiki ?:
http://pve.proxmox.com/wiki/Upgrade_from_2.3_to_3.0

[h=2]Minor Grub2 issue[/h]After running the upgrade, the grub menu list still shows on reboot the 1.98 grub version from Squeeze. To upgrade this to 1.99, just run:
grub-install '(hd0)'
 
spirit said:
do you have followed the wiki ?:
http://pve.proxmox.com/wiki/Upgrade_from_2.3_to_3.0

Minor Grub2 issue

After running the upgrade, the grub menu list still shows on reboot the 1.98 grub version from Squeeze. To upgrade this to 1.99, just run:
grub-install '(hd0)'
Click to expand...

I did follow the wiki, got the to the reboot part but did not see that step listed down at the bottom before rebooting. It doesnt imply it would cause this?

I suspect its something to do the hetzner disk setup. I have booted up hetzners rescue disc which is based on squeeze to try and take a look but tips would be very welcome.
 
ZeroHour, did you manage to solve this?
I just upgraded a server at Hetzner with the same result...

...
Welcome to GRUB!

error: "symbol not found grub_divmod64_full"
Entering rescue mode...
grub rescue>


 
Onyx said:
ZeroHour, did you manage to solve this?
I just upgraded a server at Hetzner with the same result...

...
Welcome to GRUB!

error: "symbol not found grub_divmod64_full"
Entering rescue mode...
grub rescue>
Click to expand...

Yes my server is up and running 3 now.
The rescue boot in hetzner robot can allow you to repair your setup but its not automated (DO NOT USE installimage) but the recue prompt can fix it.
I am trying to track down what I did but basically I booted the 64bit rescue system, mounted the relevant local drives then reinstalled grub to the primary boot drive.
Did you do an hetzner auto build type conf too?
I did bookmark the steps I needed to take so its in my rig somewhere...
 
ZeroHour said:
what I did but basically I booted the 64bit rescue system, mounted the relevant local drives then reinstalled grub to the primary boot drive.
Click to expand...

I was just trying that but no success so far. Your exact steps would be very helpfull. Thank you in advance!
 
I Just managed to fix it too.
For further reference, these are the steps. (this is about a Hetzner dedicated server)

- Boot from the Hetzner Linux 64bit Rescue system
- mount /dev/sda3 /mnt # main partition
- mount /dev/sda2 /mnt/boot # boot partition
- mount --bind /sys /mnt/sys
- mount --bind /proc /mnt/proc
- mount --bind /dev /mnt/dev
- chroot /mnt

Now I folowed this from step 2:
http://ubuntuforums.org/showthread.php?t=1581099

- apt-get purge grub grub-pc grub-common
- apt-get install grub-common grub-pc # (select /dev/sda)
- update-grub
- exit
- reboot
 
I just had one more problem after rebooting; It started the wrong kernel. It was a non-openvz kernel.
Fixed it by editing /boot/grub/grub.cfg and putting the pve kernel first on the list.
 
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