Your disks volume can’t boot, so it’s dropping you to a prompt to investigate. You need to run a disk check with ‘fsck’ at a minimum. If you’re not familiar with the CLI , just boot a LiveISO, and check your system disks from a desktop you’re familiar with.
Boot to the previous kernel and run updates until you get a 6.9, or go download and install the rpms yourself.
They pushed a bad patch with 6.8.10 I think? They had to roll it back and push another real quick, but some caching issue still delivered it to a bunch of people. You should on the 6.9 line now anyway as 6.8 is EOL.