Comment 3 for bug 1892369

You can boot with a cmdline option to skip that.

http://manpages.ubuntu.com/manpages/hirsute/en/man7/casper.7.html#recognized%20boot%20options

fsck.mode=skip
              Let you skip the file system check on boot.

Can you ellaborate a bit more, and make sure that the console you are observing is the one connected to the grub/initrd?

Is this a serial console, tty1, hvc0 or something else?