Not able to install package in Raspbian using apt package manager

[ShashankVM]

Hi,

The command
curl https://apt.matrix.one/doc/apt-key.gpg | sudo apt-key add - && echo "deb https://apt.matrix.one/raspbian $(lsb_release -sc) main" | sudo tee /etc/apt/sources.list.d/matrixlabs.list
returns

Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)). gpg: no valid OpenPGP data found

This is on the latest version of Raspbian.
See also:

• This comment on this tutorial on Hackster.io : https://www.hackster.io/matrix-labs/program-matrix-voice-esp32-with-vs-code-using-platformio-3dd498#comments
• https://community.matrix.one/t/cant-install-matrix-hal/3288

Please fix this issue at the earliest so we can use our Matrix Device. Please also update the documentation.

Regards,
Shashank V M

[Nailik]

This issues is also adressed here matrix-org/synapse#1855

Their solution is to use another link
curl https://packages.matrix.org/debian/matrix-org-archive-keyring.asc | sudo apt-key add -

But this ends up in
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B16A1706B2DD19C3

Workaround for this is to open the sources file

sudo nano /etc/apt/sources.list.d/matrixlabs.list
and edit it to:
deb [trusted=yes] https://apt.matrix.one/raspbian buster main

Another thing worth noting is that
matrixio-creator-init seems to be not availablie on bullseye (neither 32 nor 64 bit), only on buster