Solution about "GPG key error when attemting to download updates"

I am working on a linux computer right now, and encounter this error.

Just record some information useful here...

Try opening Software Sources, go to the Authentication tab, and remove the keys for Extras and Ubuntu Archive. If you also see one for Security, remove that one as well.

Then run 'sudo apt-get update' again. You will get the authentication errors. Copy the numbers to the following command (you can use the full code rather than just the last 8 characters) and try adding them again.

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys < add keys here >

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发现该问题依旧存在，继续关注……