Hi,
Welcome to the forum!
Do you use ssh
to connect to the lxplus?
If so, then maybe you forgot the option -X
to allow graphics to be transmitted as well, then you can try:
ssh -X usename@host
If this is the issue, then launching any applications with gui shouldn’t work, e.g. try to run gedit
and see if its window will pop up
cheers,
Bohdan