XRDP on Ubuntu 18.04LTS

It works fine with my desktop!

The good news is it works good with Nvidia drivers so far.

However there is still some issue to be fixed:

1. If you are not logout in local, the remote login would fail.

2. It would ask you to input password after login once again.

   

3. After login, it would ask for a authentication.

   

   And this authenticate would never pass unless you click cancel. (Just cancel it, then you can get in the Desktop.)

to avoid the authenticate popup,you might execute the command below
(provide by this post):

sudo bash -c "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

If the problem is not solved, I'll suggest you to:

1. Install drivers by:

   sudo apt-get update
   sudo ubuntu-drivers autoinstall
   

2. Log out any local logged-in account.

To answer the OPs question:

Ubuntu didn't work until I added gnome-session to /etc/xrdp/startwm.sh. I commented out the test and exec lines at the bottom of the file and added gnome-session (not sure if that was the correct way to do it or not... but it worked).

It prompts me for access to create a color correction device. I authenticated and had to reboot for the prompts to go away.

If you're going to try other flavors, here is what I found:

I just did a fresh install of 18.04 UbuntuBudgie, Kubuntu, Xubuntu, and Ubuntu. Only Kubuntu worked with XRDP out of the box on bare metal with hardline networking.

Kubuntu gives you a desktop but nags you about a network connections policy. I removed the network widget from the system tray and it worked without hassle after that. This was the smoothest experience of the ones I tried out.

Xubuntu didn't work out of the box (This fixed it - How to configure XRDP to start cinnamon as default desktop session - See the section that has startxfce4 in there which amounts to adding startxfce4 to /etc/xrdp/startwm.sh).

UbuntuBudgie didn't work until I added budgie-desktop to /etc/xrdp/startwm.sh. Again not sure if that was the "correct" way to do it but it worked.