barracuda@barracuda-Lenovo-G550:~$ sudo apt-get update
[sudo] password for barracuda:
E: Could not get lock /var/lib/apt/lists/lock - open (11: Resource temporarily unavailable)
E: Unable to lock directory /var/lib/apt/lists/
E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
barracuda@barracuda-Lenovo-G550:~$