Moved pi3b+ PA v5 to pi4b+ PA v6 - seeing 978 errors

 

You have a PiAware SD Card image as your command prompt pi@piaware:~ $ shows, but you followed procedure & settigs for a package install.

As you have not plugged in dump978 dongle, this is a case of “using only 1090 Mhz”. To stop piaware from continously trying to start dump978-fa, use following procedure:

Note:

The setting “using1090 only” is default setting of piaware SD Card image, but this setting was removed when you upgraded using procedure for package install. Above noted 3 commads will restore the default stting.