Ubuntu E: Unable to obtain lock /var/lib/dpkg/lock-frontend - open (11: Resource temporarily unavailable)

Ubuntu 18.04, other versions of Ubuntu

question:

When running sudo apt-get install/update/or other commands, the following prompt may appear for various unclear reasons:

E: Unable to obtain 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?

This problem may be caused by:

In the Ubuntu system terminal, when using apt-get install to install software, if the terminal is forcibly closed before the download is completed. The apt-get process may not be finished at this time. As a result, if you run the apt-get install command again to install the software, the above error will appear. That is, another program is occupying the apt-get install process. Because it is running, it will occupy the system lock for software source updates (referred to as 'system update lock'), and the resources are locked at this time.

So, in the first method , we just need to kill the previous process and release the system lock:

ps -e|grep apt-get

show

5873 ? 00:00:01 apt-get

Then execute

sudo kill 5873

The second method is to force unlock

linuxidc@linuxidc:~$ sudo rm /var/cache/apt/archives/lock
[sudo] linuxidc's password: 
linuxidc@linuxidc:~$ sudo rm /var/lib/dpkg/lock 

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