Unable to acquire dpkg frontend lock, is another process using it

If you’re facing issues in upgrading the Ubuntu System with Error like “Unable to acquire dpkg”, It can be for many reasons. We can fix dpkg frontend lock error and can not open the lock file in ubuntu. To fix this issue, follow the below steps. 

When you face unable to acquire the dpkg frontend lock-in ubuntu when updating the packages. Sometimes, the system files get locked and there’s an only way to solve this issue is we have to remove those files and again try to update the system.

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

Unable to acquire dpkg frontend lock, is another process using it.

Try to Upgrade The System

sudo apt-get upgrade

dpkg frontend lock

Step 1: Find and kill all apt process which is 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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dpkg frontend error

Step 3: We have to remove the lock-frontend files.

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

could not open lock file

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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Once you have updated the DPKG database then run “sudo apt update” and let it finished. we will upgrade the system using the below commands.

you can see the file lock issue resolved and now we have to Press “y” to update the system to get the latest version and later run “sudo apt upgrade -y“.

You’re done dpkg frontend lock could not open lock file dpkg lock ubuntu error

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I'm the founder of Curious Viral. I hope this blog will provide you complete information about Linux Technology & I would like to share my technical knowledge with you which I have learned during this period.

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