[Pakage Error] Could not get lock /var/lib/dpkg/lock-frontend

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?

 

 * 해결방법

$ sudo killall apt apt-get
$ sudo rm /var/lib/apt/lists/lock
$ sudo rm /var/cache/apt/archives/lock
$ sudo rm /var/lib/dpkg/lock*
$ sudo dpkg --configure -a
$ sudo apt update