frontend locked in ubuntu solve

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. 

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

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

Or 

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: 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

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

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