Public bug reported:
Upgrade of a kvm based virtio vm from 10.04 to 12.04 (beta).
Note: slightly broken "do-release-upgrade -d" as some library keep
causing screen to crash. apt-get update and apt-get dist-upgrade
completed the upgrade.
Seems the Linux kernel server package for 10.04 - which is 2.6.32-39-server -
defaults to upgrading to 3.2.0-18-GENERIC. I think - have not confirmed - that
this kernel does not contain drivers for virtio blockio. So boot fails with
"Unable to mount root fs on unknown-block" boot errors.
I was able to boot into the 10.04 kernel, and after some investigation
replace the -GENERIC kernel with the -VIRTUAL kernel. The system now
boots correctly.
nic@shell:~$ lsb_release -rd
Description: Ubuntu precise (development branch)
Release: 12.04
nic@shell:~$ cat /proc/version_signature
Ubuntu 3.2.0-18.28-virtual 3.2.9
nic@shell:~$ sudo lspci -vnvn | grep Virt
00:03.0 Ethernet controller [0200]: Red Hat, Inc Virtio network device
[1af4:1000]
00:04.0 Ethernet controller [0200]: Red Hat, Inc Virtio network device
[1af4:1000]
00:05.0 SCSI storage controller [0100]: Red Hat, Inc Virtio block device
[1af4:1001]
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/950529
Title:
10.04 kvm vm upgrade to 12.04 - boot fail on 3.2.0-18-generic, but
will boot 2.6.32-39-server
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