Ubuntu: apt upgrade NO_PUBKEY for kitware repository

Assume you have the following error:

$ sudo apt upgrade
...
9 packages can be upgraded. Run 'apt list --upgradable' to see them.
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://apt.kitware.com/ubuntu jammy InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1A127079A92F09ED
W: Failed to fetch https://apt.kitware.com/ubuntu/dists/jammy/InRelease  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1A127079A92F09ED
W: Some index files failed to download. They have been ignored, or old ones used instead.

The kitware repo is added via

$ cat /etc/apt/sources.list.d/kitware.list
deb [signed-by=/usr/share/keyrings/kitware-archive-keyring.gpg] https://apt.kitware.com/ubuntu/ jammy main

Solution: Install the key via

$ sudo apt install kitware-archive-keyring

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Source: https://apt.kitware.com/