E: Could not get lock /var/lib/dpkg/lock - open (Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
You can delete the lock file with the following command:
sudo rm /var/lib/apt/lists/lock
You may also need to delete the lock file in the cache directory
sudo rm /var/cache/apt/archives/lock sudo rm /var/lib/dpkg/lock
After that, try opening Terminal again.