Yes this is possible.
STEP 1:
Ubunutu supports Remote Desktop sessions by default.
Visit this page https://help.ubuntu.com/stable/ubuntu-help/sharing-desktop.html.de to install GNOME Remote Desktop first on your Ubuntu machine.
Follow the instruction and enable Remote Desktop Support in the Ubuntu settings.
- Enable the "Enable Legacy VNC Protocol"
- Set the "Request Password" option behind the "Enable Legacy VNC Protocol" settings
- Set the switch "Remote Control" to enable
- Set a user and set a password finally
- Leave the settings dialog
The remote desktop access via VNC clients is now already available via <Ubuntu machine IP address>:5900
STEP 2:
Install the noVNC function that turns VNC based protocol sessions into html5 sessions made for web browsers
Use the following command on your Ubuntu machine
sudo apt install novnc
STEP 3:
For a test start the noVNC function manually with (or create a "Start Application" and insert the line in the command line for an automatic start)
/usr/share/novnc/utils/launch.sh --vnc 127.0.0.1:5900
STEP 4:
Start a web browser session from a different machine with
http://<<Ubuntu machine IP address>:6080/vnc.html
STEP 5:
Login with the password
STEP 6:
Enable the "Remote Control" function for your Ubuntu device in netFIELD Cloud
Configure the "Remote Control Settings" of your Ubuntu device as follows:
host = 127.0.0.1
http port = 6080