Hi there,
I tried to update my Ubuntu version on my Lenovo Thinkpad T480s over night and when I came back in the morning, the system didn't boot properly. It gets stuck with a purple screen and I am not able to log in. I tried to go into the grub menu and boot it in recovery mode which gave me an error message saying: kernel panic, unable to mount root fs on unknown block.

Any ideas on how to solve the issue or go back to the older version? I am also slightly concerned about my data, is there a way to save it before trying to reinstall another version or shouldn't it be a problem?

I attached pictures of the grub menu and the error message for clarification and please let me know if you need further information. Any help is highly appreciated!

Do you have a bootable external medium, such as an Ubuntu live DVD? If so, you may be able to get access to your machine and drives through that. The DVD might also have a recovery option.

Sorry, I hope it worked now!?

Attached Thumbnails

     

I have no external boot devive at the moment. I can boot into recovery menu where I can access the terminal and there I see that all files are still there at least However, as I am very inexperienced with this I'm afraid to mess it even more up.

Are there any more lines on that Ubuntu entry (the third thumbnail you posted) ?.That's a bit of a surprise - can you also post that entry - all of it.
Have you tried an earlier kernel (5.0) ?.