pi@piaware:~ $ sudo apt update
Hit:1 http://flightaware.com/mirror/raspbian/raspbian bullseye InRelease
Hit:2 http://flightaware.com/adsb/piaware/files/packages bullseye InRelease
Hit:3 http://repo.feed.flightradar24.com flightradar24 InRelease
Hit:4 http://flightaware.com/mirror/raspberrypi/debian bullseye InRelease
Hit:5 https://apt.rb24.com buster InRelease
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
1 package can be upgraded. Run 'apt list --upgradable' to see it.
pi@piaware:~ $ sudo apt list --upgradable
Listing... Done
mlat-client/unknown 0.2.11 armhf [upgradable from: 0.2.11]
N: There is 1 additional version. Please use the '-a' switch to see it
pi@piaware:~ $ sudo apt list --upgradable -a
Listing... Done
mlat-client/unknown 0.2.11 armhf [upgradable from: 0.2.11]
mlat-client/now 0.2.11 armhf [installed,upgradable to: 0.2.11]
pi@piaware:~ $
You do NOT have extra mlat-client on your RPi.
The apt is reading apt sources list which includes RB24 repository, and lists their mlat client.
Give following command and it will show RB24 repository list
ls /etc/apt/sources.list.d/
You will see one file name something like rb24.list (I dont remember exact name). Delete it, then run update command, the annoying mlat-client messages will stop.
You do NOT have extra mlat-client on your RPi.
The apt is reading apt sources list which includes RB24 repository, and lists their mlat client.
Give following command and it will show RB24 repository list
ls /etc/apt/sources.list.d/
You will see one file name something like rb24.list (I dont remember exact name). Delete it, then run update command, the annoying mlat-client messages will stop.