RDP connection from Windows 10 to Ubuntu Desktop 20.04

Even if I connected it for a long time, the screen was black, so I had a memorandum. The cause is that if there is an existing login session, I can not log in and the screen goes black, but I feel that it does not come unexpectedly. So if you can't enter with pkill gnome-session, it doesn't make sense to follow the steps below.

procedure

I've listed what seems to be necessary for the time being, but it may not be necessary or there may be a shortage, so it's appropriate.

1. Install xrdp if xrdp is not included
2. I feel like the Desktop version was included from the beginning
3. Open the 3389 port
   1. sudo ufw allow 3389
4. Kill auto login
   1. sudo sed -ie 's/AutomaticLoginEnable=true/AutomaticLoginEnable=false/' /etc/gdm3/custom.conf
5. After that, restart it, connect it from the remote desktop of Windows, and if the screen appears, it's OK
   1. sudo reboot

bonus

It seems that the unlock login key ring dialog will not appear if this is played, but it has not been verified.

cat > /etc/polkit-1/localauthority/50-local.d/45-allow-colord.pkla <<EOF
[Allow Colord all Users]
Identity=unix-user:*
Action=org.freedesktop.color-manager.create-device;org.freedesktop.color-manager.create-profile;org.freedesktop.color-manager.delete-device;org.freedesktop.color-manager.delete-profile;org.freedesktop.color-manager.modify-device;org.freedesktop.color-manager.modify-profile
ResultAny=no
ResultInactive=no
ResultActive=yes
EOF
cat > /etc/polkit-1/localauthority/50-local.d/46-allow-update-repo.pkla<<EOF
[Allow Package Management all Users]
Identity=unix-user:*
Action=org.freedesktop.packagekit.system-sources-refresh
ResultAny=yes
ResultInactive=yes
ResultActive=yes
EOF