Instead of using the labs ( I was facing many network issues with that), I decided to set up the tools locally. I was able to create the testbench schematic, but I'm not getting any GUI for NGspice when I'm clicking simulate. Any suggestions for the same?

the results and setup might not be similar to what you see in the workshop as the pdks and tool versions might have been updated but worth giving a try

@Yatharth Agarwal try typing ngspice from the terminal to see if ngspice is working

@Yatharth Agarwal Do you have xterm installed?

Thanks a lot @NatarajP that seems to have exactly been the issue.