unable to dpkg

Unable to acquire dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it.

If you’re facing issue in upgrading the Ubuntu System with Error like ” Unable to acquire dpkg “, It can be as of many reason. To fix this issue, follow below steps. 

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you can get this error because there was already a process running and might be because of update command.

Try to Upgrade The System

sudo apt-get upgrade


Step 1 : Find and kill all apt process which are running.

ps -A | grep apt

Now kill the process using the below commands

kill -9 processnumber


kill -9 SIGKILL processnumber

Step 2 : Check the location of lock-frontend

When you run apt-get or apt command, a lock file can be created under these directories, /var/lib/dpkg/, /var/cache/apt/archives/ and /var/lib/apt/lists.

ls /var/lib/dpkg/

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Step 3 : Remove the lock-frontend

sudo rm /var/lib/dpkg/lock-frontend 

sudo rm -rf /var/lib/apt/lists/lock 

And also remove this file too.

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

Step 4 : Verify

ls /var/lib/dpkg/

As you can see now I’m able to upgrade the system, Now run this command to build up the dpkg packages.

sudo dpkg –configure -a

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You’re done


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