If you’re one of those unfortunate souls that run into the following error when running apt update
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Err:5 https://dl.yarnpkg.com/debian stable InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 4F77679369475BAA |
you are not alone. Fortunately the fix is easy, but it’s buried in the comments, so here it is without a lot of wading:
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sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 4F77679369475BAA |
Rerun apt update (or the apt-get equivalent), and you should be golden.