iting for cache lock: Could not get lock /var/lib/dpkg/lock-frontend. It is held by process 13959 (unattended-upgr) code example
Example 1: E: Could not get lock /var/lib/dpkg/lock-frontend - open (11: Resource temporarily unavailable) E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it?
ps aux | grep -i apt
sudo kill <process_id>
sudo kill -9 <process_id>
sudo killall apt apt-get
Example 2: E: Could not get lock /var/lib/dpkg/lock-frontend - open (11: Resource temporarily unavailable)
sudo rm /var/lib/apt/lists/locksudo rm /var/lib/apt/lists/lock-frontend