E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?

You have two errors here.

1. You are missing a GPG key
2. The dpkg lock file is locked.

You should fix (2) before you fix (1).

Open a terminal and type

sudo lsof /var/lib/dkpg/lock

Enter your password. It will not be echoed to the screen.
This will tell you what has got a lock on dpkg.
Post the results back here. I am interested to see what has a lock on dpkg.

You can then either close that program, restart your PC or send a -TERM to the program with the lock by using kill and the pid.

After that you need to import the key.

EDIT: Added command.

sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 2EBC26B60C5A2783

sudo apt-get update

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