E: 10mount: mount: wrong fs type, bad option, bad superblock on xenial-amd64,
E: 10mount:        missing codepage or helper program, or other error
E: 10mount:        (for several filesystems (e.g. nfs, cifs) you might
E: 10mount:        need a /sbin/mount.<type> helper program)
E: 10mount:        In some cases useful info is found in syslog - try
E: 10mount:        dmesg | tail  or so
E: 10mount: 
E: xenial-amd64-c4f277c6-622c-4c1b-82f7-2e6580892c95: Chroot setup failed: stage=setup-start