Ubuntu apt报错：unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend)

错误信息

E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend

解决方法

首先kill所有apt apt-get进程

sudo killall apt apt-get 

然后试着apt install package，要是仍然报错，直接把lock删了

sudo rm /var/cache/apt/archives/lock
sudo rm /var/lib/dpkg/lock