Could not get lock /var/lib/apt/lists/lock. It is held by process 1981 (apt-get)

This error message means that the process with ID 1981 is currently holding a lock on the file "/var/lib/apt/lists/lock", preventing other processes from accessing it.

Related articles:

Resolving the 'Could not get lock /var/lib/apt/lists/lock' Error when Running apt-get
The apt-get command is an essential tool for managing software packages on Linux systems. However, when running apt-get commands, you may encounter an error message that reads Could not get lock /var/lib/apt/lists/lock - open (11: Resource temporarily unavailable).

Understanding the Cause and Solution to the apt-get Lock Error
The apt-get is a popular package management tool in Unix-based systems. It allows users to install, upgrade, and remove packages easily. However, there are times when users come across an error message that says "E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)" or "E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?". This error message prevents users from managing packages using apt-get. In this article, we will discuss the causes of the apt-get lock error and how to solve it.

Quick Fixes for the 'Process 1981 (apt-get)' Lock Error When Updating Ubuntu Packages
If you're using Ubuntu, you might have encountered an error message that looks like this: