Debian/Ubuntu using apt

When running apt-get update to refresh the update source under Ubuntu and Debian, we often encounter the problem of "There is no public key available for the following key IDs", which is specifically manifested as the following error message:

W:There is no public key available for the following key IDs: 3B4FE6ACC0B21F32, W:There is no public key available for the following key IDs: 3B4FE6ACC0B21F32,

The solution is as follows,

sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 3B4FE6ACC0B21F32

Replace 3B4FE6ACC0B21F32 with the IDs you have problems with

In addition, if you have the following problems, it is because the natty-backports source has been added, just delete it

W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/natty-backports/main/source/Sources 404 Not Found [IP: 91.189.91.13 80], W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/natty-backports/restricted/source/Sources 404 Not Found [IP: 91.189.91.13 80], W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/natty-backports/universe/source/Sources 404 Not Found [IP: 91.189.91.13 80], W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/natty-backports/multiverse/source/Sources 404 Not Found [IP: 91.189.91.13 80],

Run the following command:

sudo sed -i '/natty\-backports/d' /etc/apt/sources.list{,.d/*}

via: https://www.vmvps.com/apt-get-error-no-public-key-available-solution.html

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