Ubuntu 업데이트 시 에러

E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
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?

 

해결책)
# rm /var/lib/dpkg/lock
# rm /var/cache/apt/archives/lock