How exactly did you install bitcoin core on ubuntu? Is your main OS Windows 10?

If you can't connect to a display, and you're running ubuntu localhost, you'll need to install a X-server.

https://sourceforge.net/projects/vcxsrv/

Then run something like

https://seanthegeek.net/234/graphical-linux-applications-bash-ubuntu-windows/

Just tried and it worked for me.