Thanks a ton.
Works like a charm.

Hi, I am trying to install Mavlink on Raspberry Pi4 running Buster. It has Python 2.7.16 and Python 3.7.3 versions installed when I check. However, I get the following error while trying to install Mavlink as per the procedure given at https://ardupilot.org/dev/docs/raspberry-pi-via-mavlink.html pi@...

Is there some issue with the archives?

I get the following message :-

The repository 'http://raspbian.raspberrypi.org/raspbian buster InRelease' is no longer signed. Updating from such a repository can't be done securely, and is therefore disabled by default.