Thanks for the response!
Now, connecting to the SuSE server as myself (using my username) allows me to run xclock.
However, when I sudo to root (sudo bash) the display error is back (Error: Can't open display
.
I'm connecting from home network (behind a wireless router so my IP address is a standard 192.168.x.x) using this command:
ssh -Y -i <private_rsa_key> <username@<susehostname>
After connecting I can run xclock and see it working on my Ubuntu desktop. Now, sudo to root:
sudo bash
and the xclock returns the "Can't open display:" error. Any suggestions?
Thank you in advance!