Ubuntu20.04にxrdpで接続するとAuthentication Requiredが発生する件

 これで解決

xRDP – New “Authentication Required…” Popup showing up in Ubuntu 19.04 – Griffon's IT Library (c-nergy.be)

/etc/polkit-1/localauthority/50-local.d/45-allow-colord.pkla

[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

[Allow Package Management all Users]
Identity=unix-user:*
Action=org.debian.apt.*;io.snapcraft.*;org.freedesktop.packagekit.*;com.ubuntu.update-notifier.*
ResultAny=no
ResultInactive=no
ResultActive=yes

$ sudo systemctl restart polkit

xrdp用のその他設定

https://qiita.com/underwell111/items/c0069a4d39d3694e1d4a

sed -e 's/^new_cursors=true/new_cursors=false/g' -i /etc/xrdp/xrdp.ini
sudo systemctl restart xrdp

$ D=/usr/share/ubuntu:/usr/local/share:/usr/share:/var/lib/snapd/desktop
$ cat <<EOF > ~/.xsessionrc
export GNOME_SHELL_SESSION_MODE=ubuntu
export XDG_CURRENT_DESKTOP=ubuntu:GNOME
export XDG_DATA_DIRS=${D}
export XDG_CONFIG_DIRS=/etc/xdg/xdg-ubuntu:/etc/xdg
EOF