I reinstalled all packages with `dnf reinstall $(rpm -qa --qf “%{NAME}\n”) --skip-unavailable --setopt=protected_packages=` in chroot environment, in order to fix the system after an unsuccessful update. Now the system fails to boot. When trying to start Fedora using GRUB mode, the following error message appears.
I forgot to mention, after reinstalling I also updated grub and initramfs using grub2-mkconfig -o /boot/grub2/grub.cfg and dracut --force --regenerate-all.
You could have a failing root storage device. Using the Live USB you can check “health” and free space to rule out device problems. Note that for btrfs filesystems you should use btrfs filesystem usage /path.