Where do I download Lubuntu's PGP key to verify sha256 checksum?

I’m currently on Linux Mint and I’ve installed the SHA256 checksums from Ubuntu cdimage and I’m trying to verify the PGP to the txt file, but I don’t know which key to install. Also, I’m a complete Linux noob still so I’d be helpful if someone could also provide the syntax I need to use in the terminal to install said PGP key. I’m currently using this guide as a reference but again, it’s no use without the correct PGP key.

Welcome to the Lubuntu community.

I’d usually opt for official guides, ie. https://tutorials.ubuntu.com/tutorial/tutorial-how-to-verify-ubuntu#0 where “Retrieve the correct signature key” section may be what you’re looking for.

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