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I have the following problem: I was trying to upgrade from Ubuntu 13.10 to Ubuntu 14.04 and in the middle (after the necessary packages were downloaded and beginning to be installed), I ran out of space so the whole process froze. After that the only thing I could do was to reboot.

But after the reboot I start getting a:

Kernel panic - not syncing : VFS : Unable to mount the root fs on unknown-block(0,0)
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.13.0-24-generic #47-Ubuntu
and continues with some Call Trace...

I can still enter the grub menu and select between old kernels and in this case it actually boots correctly with Ubuntu 14.04 but then I cannot do anything through the Unity GUI. I can however use a virtual console with Ctrl+Alt+F1 for example...

Anyone had the same problem or knows any way to fix this?


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up vote 4 down vote accepted

Maybe something went wrong during update and this will be enough?

Repair after bad update

sudo apt-get update

sudo apt-get -f dist-upgrade

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Thank you very much, you are right. – Cooli May 11 '14 at 0:08
Firstly I thought about compiling new kernel but Unity problems suggested me unfinished installation – pgr May 11 '14 at 0:09

I ran into a similar problem and here is what I did along with the above steps.

  • Goto recovery/rescue mode from the grub menu, while restarting.
  • Made space available in root partition (alternatively you can extend it if you are using LVM)
  • sudo apt-get update
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