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Several Ubuntu 10.04 VMs were restarted after few months and began getting "Kernel Panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)" message. Restoring those VMs from backup (to the "paused" state) allows to boot normally. However restarting the VM again results in the mentioned error message. I suspect it's the updated kernel version (2.6.32-37-server, 2.6.32-38-server) that misbehave - another Ubuntu VM (that's used as template for those failing VMs) still has 2.6.32-24-server and reboots fine. We're using HyperV (2008R2) as the server host. Nothing were changed in it's configuration. Has anyone faced this issue, please advise the solution. Many Thanks in advance!

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closed as too localized by fossfreedom Jan 26 '13 at 19:46

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This question appears to be abandoned and unanswered. Could you perhaps add more detail to your question? If this question no longer applies then you can either delete it or answer it yourself if you've solved the problem. Thanks! –  Seth Jan 26 '13 at 15:42
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1 Answer

We would not expect to see issue with these newer kernels on Hyper-V. You should be able to find the older kernels in the boot menu (holding shift in early boot) to recover the VMs.

To get this looked into you should file a bug in launchpad against the package linux and include as many details as you can. If there is a regression it would have occured in one of the kernels between the last working one and the latest. All of these kernels are available in the launchpad librarian (see the URL below) and if you could test those to find the first version which will not boot, that would be most instructive. Please include all of this in your bug:

https://launchpad.net/ubuntu/+source/linux/+publishinghistory
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