Comment 1 for bug 1821053

If I force the SMB1 protocol (vers=1.0), then the mount works:

root@ubuntu:~# mount //localhost/pub /mnt -o guest,vers=1.0
root@ubuntu:~# mount -t cifs
//localhost/pub on /mnt type cifs (rw,relatime,vers=1.0,sec=none,cache=strict,uid=0,noforceuid,gid=0,noforcegid,addr=127.0.0.1,soft,unix,posixpaths,serverino,mapposix,acl,rsize=1048576,wsize=65536,echo_interval=60,actimeo=1)
root@ubuntu:~# uname -r
5.0.0-7-generic
root@ubuntu:~#