If you get the following error when executing commands with apt-get:
E: Unable to access the lock file /var/lib/apt/lists/lock - open (11: Resource is temporarily unavailable)
E: Unable to block directory /var/lib/apt/lists/
To get rid of this error, just remove the lock
Such an error occurs if you close or cancel (Ctrl + C, Ctrl + Z) the execution of any of the apt-get commands.