How to Fix apt-get update GPG error BADSIG on Ubuntu or Debian

In this tutorial, we will show you how to Fix apt-get update GPG error BADSIG on Ubuntu or Debian. Today I encountered another apt-get update GPG error, this time I got the error message BADSIG :

Fix apt-get update GPG error BADSIG on Ubuntu or Debian

After a few research, I found the solution from askubuntu and StackExchange. Please use the following commands to get rid of your problem:

Please do that with the corresponding error key from your error message log.

The next step is to clear your apt software cache:

Then you are done and may try our favorite apt-get command:

And you should encounter no error anymore.

For you who didn’t know yet about apt-get update, it’s a Linux command specifically for Ubuntu and Debian to update apt or software repository cache. apt-get the command itself is a powerful command-line tool to perform such function as installation of new software packages, upgrade of existing software packages, updating of the package list index, and even upgrading the entire Ubuntu/Debian system.

Thanks for using this tutorial for Fix apt-get update GPG error BADSIG on Ubuntu or Debian. For additional help or useful information, we recommend you to check the official Ubuntu website.

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