I'm not cheating you. Have a try before you type. After you create .Xauthority manually, ssh -X could work, though 'auth add' still fails why not try it yourself?
following shows 'ps -ef' and 'XDG_SESSION_TYPE' source@debian:~$ ps -ef |grep Xwayland Debian-+ 3802 3782 0 08:10 tty1 00:00:00 /usr/bin/Xwayland :1024 -rootless -noreset -listen 4 -listen 5 -displayfd 6 source 4062 4043 2 08:10 tty3 00:00:37 /usr/bin/Xwayland :0 -rootless -noreset -listen 4 -listen 5 -displayfd 6 source 6556 6528 0 08:36 pts/5 00:00:00 grep Xwayland source@debian:~$ echo $XDG_SESSION_TYPE wayland source@debian:~$ On Mon, May 6, 2019 at 8:28 AM Francisco M Neto <fmn...@fmneto.com.br> wrote: > > On Mon, 2019-05-06 at 07:54 -0600, An Liu wrote: > > Partly right, Debian 9.9 tested > > Debian 9.9 uses X.Org. > > This kind of operation is not possible in Wayland. > > -- > []'s, > > Francisco M Neto > > GPG: 4096R/D692FBF0 -- Liu An