Solved: Error, Could not get lock /var/lib/apt/lists/lock. It is held by process (PID) (packagekitd)

 The error message you're seeing indicates that another process, specifically packagekitd in this case, has locked the package management system, making it unable for you to run updates or install new software using apt. Here's how you can resolve this issue:



Wait: First, it's possible that another package management task is running in the background. You should wait for it to complete. It might be a software update or installation process initiated by your system.


Identify and Terminate the Locking Process: If waiting doesn't work, you can identify the process that's holding the lock and terminate it. You can use the lsof command to find the process that's holding the lock:

sudo lsof /var/lib/apt/lists/lock


This command will list the process that's using the lock file. You can then use the kill command to terminate that process. For example:

sudo kill -9 <PID>


Replace <PID> with the process ID of the packagekitd or the process listed in the output of the lsof command.


Clean the Lock: If you're sure there are no important package management tasks running, and you've terminated the process holding the lock, you can remove the lock file:

sudo rm /var/lib/apt/lists/lock


After removing the lock file, try running sudo apt update again.


Reboot: If the issue persists and you're not sure which process is holding the lock, or if you're concerned about potential issues, you can reboot your system. This will release all locks and should allow you to run apt commands without any conflicts.

After following these steps, you should be able to run sudo apt update without encountering the "Could not get lock" error.

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