How to fix error installing mysql 5.7 - public key is not available: NO_PUBKEY B7B3B788A8D3785C

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i want to install mysql 5.7 in ubuntu 22.04, but during the installation process, i got error:

The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B7B3B788A8D3785C
Reading package lists... Done
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

solution:

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