Are you on Win 10 or Win 11. I upgraded Win 10 to Win 11 simply to make using the GUI easier. AFAIK, with Win 10 you need to install an Xserver on Windows, whereas Win 11 provides the graphics card direct to Ubuntu.
To re-affirm my memory of how easy it was on Win 11, I just did a new install (Ubuntu.20.04.5 LTS) then immediately did the following…
$ ping ubuntu.com
$ sudo apt update
$ sudo apt install gedit
$ gedit
[Edit: I notice the link provided by @Fahim includes these.]