Greetings again! In case anyone else has run into this, I wanted to post a problem and solution I ran into yesterday. This happened to be on Ubuntu 20.04, but it would likely happen on any Debian (or other) machine that is running base OS software from years ago and has been updated and patched along the way. Since aprsc no longer supports i386 architecture, it's possible you might encounter this error when updating your repo:
Skipping acquire of configured file 'main/binary-i386/Packages' as repository '
http://aprsc-dist.he.fi/aprsc/apt focal InRelease' doesn't support architecture 'i386'
For Ubuntu/Debian, the simple fix was to first check and make sure you are not running any i386 arch software:
$ sudo apt-get purge `dpkg --get-selections | grep ":i386" | awk '{print $1}'`
Update/remove i386 software and libs as necessary, and then remove the i386 architecture from your system:
$ sudo dpkg --remove-architecture i386
You should be able to do your repo updates now without that error. Enjoy!
73 - Phil AD6NH