I'm using Fedora 29. I had to reinstall it, but I kept a backup copy of all my folders. After installation, I booted into Ubuntu (dual boot) and copied and replaced all the backup files (including the folder, etc., usr, etc.). Then I started from Fedora 29 and I get this error:
I tried to boot in rescue mode and get the same:
I searched for it on Google, but I could not find anything useful.