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Kernel Panic : VFS :Unable to mount root fs on unknown-block [message #3207] Sat, 06 February 2016 18:32
kc2nda is currently offline  kc2nda
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Registered: December 2004
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Kernel Panic : VFS :Unable to mount root fs on unknown-block

This will happen if your memory card is corrupt. It could be an issue if the PI has been shutdown improperly or if the card is going bad.

If you have data on the card, don't get too worried yet. Get another card and boot from the PI using another card. Once the filesystem is booted, find a USB card reader, put the bad card in the card reader and find out what the card name is: There are several ways to do this. A simple df will show you the OS that is booted and you should see the other card which would be something like sda1

run this command:

sudo fsck.ext4 -fy /dev/sda1

It should fix the card. Then it should boot. Most likely it will have to run through a lot of error checking and fsck should autorun. Be patient... Worked great for me for the FIRST time in a few years using the PI that this has happened..

Good Luck!
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