Ubuntu – How to fix boot issue ? VFS: cannot open root device “mapper/x” or unknown-block(0,0)

12.04boot

I've got ubuntu 12.04 running as a virtualserver on virtualbox.

Last night there was a power surge and this morning I can't boot my virtual server.

I get a long error message. I picked this up:

VFS: cannot open root device "mapper/ubuntu–server-root" or unknown-block(0,0): error -6

when I do:

ls /dev/mapper

I get>
control
ubuntu–server-root
ubuntu–server-swap_1

I can mount manually by doing

'mkdir /foo;mount /dev/mapper/ubuntu–server-root /foo'

I don't know what to do but I installed a tool and extracted this log http://paste.ubuntu.com/7119904/

Best Answer

Your most recent kernel, 3.5.0-47-generic, is missing its corresponding initrd image. Pick the previous kernel version from the boot menu and once the system comes up, run sudo update-initramfs -c -k 3.5.0-47-generic to create the initrd, and sudo update-grub.

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