sudo apt install xrdp
It was enough with Raspbery Pi (up to Debian Buster), but not for Linux Mint. The only solution has helped me is:
echo env -u SESSION_MANAGER -u DBUS_SESSION_BUS_ADDRESS cinnamon-session>~/.xsession
Check the Firewall status…
sudo ufw status Status: inactive
If it’s INACTIVE, skip the next step…
sudo ufw allow 3389/tcp
Sources:
Using RDP With Linux
How to Connect to Linux Mint with RDP
PDF pages’ images:
Using RDP With Linux Mint 20 Cinnamon (213.0 KiB)
How To Connect To Linux Mint With RDP (519.3 KiB)