V12 to v13 upgrade. Permission denied: file: /usr/lib/python2.7/socket.py line: 228

Hi, I’m trying to upgrade v12 to v13
But error at command bench update

error: <class ‘socket.error’>, [Errno 13] Permission denied: file: /usr/lib/python2.7/socket.py line: 228

I have read all posts in forum regarding this error and tried the solutions but still cannot get past this error

Would apprecaite your help
Thank you