How to resolve the issue of being unable to access Ubun…

First, make sure you have correctly installed and configured the xrdp server.

1. Check if the xrdp service is running. You can use the following command to check:
2. Check the status of the xrdp service.
3. If the service is not running, you can use the following command to start it:
4. Start the xrdp service using sudo.
5. Check the firewall settings. If your firewall, such as ufw, is running, make sure to allow RDP (default port is 3389) traffic through. You can use the following command to check the firewall settings:
6. Check the status of the firewall using the command “sudo ufw status.”
7. If the firewall does not allow RDP traffic, you can use the following command to enable it:
8. Grant permission for port 3389.
9. Check the xrdp configuration file. You can edit the xrdp configuration file using the following command:
10. Open the xrdp.ini file using the nano text editor with superuser privileges.
11. Make sure that the following lines are not commented out and set to the correct values:
12. [xrdp1]
    name=sesman-Xvnc
    lib=libvnc.so
    username=ask
    password=ask
    ip=127.0.0.1
    port=-1
13. You can modify other settings as needed.
14. Restart the xrdp service. You can restart the xrdp service using the following command:
15. Restart xrdp service using sudo command.
16. Next, attempt to reconnect to the Ubuntu system using an RDP client.

If these steps do not solve the problem, you can also try reinstalling the xrdp server. You can use the following command to uninstall and reinstall xrdp:

sudo apt-get purge xrdp
sudo apt-get install xrdp

I hope to help solve your issue!