Error on ubuntu:  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?    Solution:  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). 2. Open a terminal and type   lsof – List Of Open Files     Code:  sudo lsof /var/lib/dpkg/lock   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.    Code:  sudo  kill <pid>   After killing the process the dpkg needs to be configured else it will throw this error:  E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem.     Code:  sudo   dpkg  --configure -a  1. Only if required: After that you need to import the key. EDIT: Added command.    Code:  sudo apt-key adv --recv-keys --keyserver keyserv...
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