I added the correct repository ok but when I try to install Elementary Tweaks i get this message in terminal
E: Could not open lock file /var/lib/dpkg/lock-frontend - open (13: Permission denied)
E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), are you root?
I haven't seen any instructions anywhere saying anything about needing to be root to install it so what's the problem? I'm relatively new to Linux and keen to learn and progress but issues like this are putting me off.