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 (matrix-io.github.io)
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 'https://apt.matrix.one/raspbian 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?