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
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.
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
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