$ sudo pacman -S base-devel yay
$ yay -S xrdp xorgxrdp
/etc/xrdp/sesman.ini
#param=Xorg
param=/usr/lib/Xorg
~/.xinitrc
exec dbus-launch --sh-syntax xfce4-session #xfce
exec dbus-launch --sh-syntax startplasma-x11 #KDE
exec dbus-launch --sh-syntax mate-session #mate
$ sudo systemctl start xrdp
$ sudo systemctl enable xrdp
#KDE Edition のみ?
$ sudo firewall-cmd --permanent --zone=public --add-port=3389/tcp
$ sudo firewall-cmd --reload