@User Hi Stefan, Thanks for your previous suggestions. I managed to install xschem and ngspice as demonstrated in the video. Now I am launching xschem from the directory $.xcshem/xschem_library/xschem_sky130/xschem & but I am getting a warning regarding PDK which I am unable to decode. Could you please help me and make me understand what the warning says? Have I made a mistake regarding PDK? I am attaching a jpg file. Thanks & Regards