1. Open the terminal and run one of these commands: sudo rm /var/lib/apt/lists/lock or rm -f /var/lib/apt/lists/lock or killall -9 apt-get aptitude Then make an update with this command: sudo apt-get update 2. Also, If you receive this error: E: Could not get lock /var/lib/dpkg/lock Via the terminal, run this command to unlock it: rm …Continue reading