Pubkey not available

Hi there!

I’m unable to install Matrix HAL due to missing gpg keys…

“the public key is not available”

Following the guides here Installation From Package MATRIX (

When adding the key, it states gpg: no valid OpenPGP data found.

Of course, when trying to apt-get it then fails with

E: The repository ' buster InRelease' is not signed.

Since everything seems tied to apt, how do I now get my matrix creator installed on my Pi 4 running latest RaspiOs?

Actually just found out that the error is on the documentation, the keys have moved, so instead, use this:

curl | sudo apt-key add -


For solve this error, you can add -L like this:

curl -L | sudo apt-key add -


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