I have heard that I can use "X11 forwarding" (whatever that means) to display graphics generated on a remote server on my local machine. Therefore, I followed these instructions (installed Xming, connecting via PuTTY) and advice from linked articles (not using PuTTY), and got nowhere. Using Ubuntu 18.04.4 (LTS) as a non-sudoer logging in with VPN access.
Here is the error I keep receiving when typing the command xclock (and yes, which xclock returns usr/bin/xclock so it is installed).
Error: Can't open display:
Regardless of how I set $DISPLAY using commands such as:
export DISPLAY=localhost:0.0
I always get this message back.