I try to do the test on x-terminal and the message was the following:

" Is -lrt /var/lib/apt/lists
-sh: Is: not found

mkdir -p /var/lib/apt/lists/partial
apt-get update
E: Could not open lock file /var/Lib/apt/lists/lock - open (13 permission denied)
E: Unable to lock the list directory "

still gives the error.....