Waiting for cache lock: Could not get lock /var/lib/dpkg/lock-frontend 해결 방법
문제
다음과 같이 Waiting for cache lock 에러가 발생하고 업데이트가 정상적으로 진행이 안되는 문제가 발생했다.
root@taking:~/ # apt install unrar -y
Waiting for cache lock: Could not get lock /var/lib/dpkg/lock-frontend. It is held by process 15973 (unattended-upgr)... 11s
^Citing for cache lock: Could not get lock /var/
