I'm using Fedora 29. I had to reinstall it, but I kept a backup of all my folders. After the installation, I booted up in Ubuntu (dual boot) and copied and replaced all the backup files (including the etc folder, and usr, etc). I then booted from Fedora 29 and I get this error:
I tried to boot in rescue mode and I get the same thing:
I googled it, but couldn't find anything helpful.