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Today I've upgraded to Ubuntu 15.10 using Ubuntu "Software Update". The download and installation went fine, till I did a restart. At some point the boot stops and the shift-lock LED is blinking on the keyboard. I've selected the recovery entry in the grub and then the following error message can be seen:

kernel panic not syncing unable to mount root fs on unkonown-block(0,0)

What can I do to fix this error?

If I boot older grub entries like kernel 3.19.0-31 it works.

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The solution was to boot the old kernel 3.19.0-31 and do

 sudo dpkg --configure -a
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  • Exact same problem, and this solved it for me. I had a slightly different version for my previous kernel, though.
    – astromax
    Oct 24 '15 at 2:07
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Thanks but this didn't work for me... I had to select the wily-proposed in software updates and then in a terminal:

sudo apt-get update

sudo apt-get upgrade

Rebooted and everything seems to be working fine now with Ubuntu 15.10 and the 4.2.0-21-generic kernel. Hope this helps someone!

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