AppVM Qube window launcher not booting

An AppVM qube will launch, but the windows themselves will not launch. There seems to be something
wrong with the X11 system. How to troubleshoot this?

After opening a console in the qube there was an error message:

status qubes-mount-dirs.service
Initialize and mount /rw and /home

failed (Result: exit-code)

Warning: some journal files were not opened due to insufficient permissions

r/w mount - failed

does this mean the mounting of the AppVM disk failed?

Another error message here:

systemctl start qubes-mount-dirs

EXT4-fs (xvdb): VFS Found ext4 filesystem with invalid
superblock checksum. Run s2fsck?