Showing this problem while updating

I ran this command in the terminal
sudo apt-get update
It is showing an error
> Err:9 https://download.sublimetext.com apt/stable/ InRelease
> The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F57D4F59BD3DF454
> Hit:17 http://ppa.launchpad.net/zorinos/stable/ubuntu bionic InRelease
> Reading package lists... Done
> W: GPG error: https://download.sublimetext.com apt/stable/ InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F57D4F59BD3DF454
> E: The repository 'https://download.sublimetext.com apt/stable/ InRelease' is not signed.
> 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.
I tried to install sublime text but it did not install and now it is showing this error.

Can someone help me with this.....
My Laptop: HP 250 G7 Notebook PC

This should solve your problem.

Before I switched to Notepadqq I used to use Sublimetext and I had the same problem after the installation.

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Thanks FrenchPress. I did remove that repository through Software and Updates Application and that solved my problem. After removing that repository, I issued the command:
sudo apt-get update && sudo apt-get upgrade
This worked fine and resolved the issue.

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