This error message is fairly common on any Ubuntu or any other Debian based Linux system.
The meaning of the Could not get lock message is rather simple. At the time you attempt to install new software or update your operating system, there is another software installation or software upgrade underway which runs in the background and was launched on another remote or local terminal by other user with administrative privileges.
The Ubuntu 20.04 GPG error: The following signatures couldn't be verified is a most common error when attempting to include third party package repositories to the apt package manager.
The GPG error should rather be treated as a warning against potential package installation from unknown sources. Therefore, the GPG error message prompts the user to verify and manually import the third party signature belonging to relevant package developer.
In this tutorial you will learn: