This is happening with Bionic, Focal & Jammy.
After applying a package profile, this happens.
sudo apt update
Get:1 file:/var/lib/landscape/client/package/binaries ./ InRelease
Ign:1 file:/var/lib/landscape/client/package/binaries ./ InRelease
Get:2 file:/var/lib/landscape/client/package/binaries ./ Release
Ign:2 file:/var/lib/landscape/client/package/binaries ./ Release
Get:3 file:/var/lib/landscape/client/package/binaries ./ Packages
Ign:3 file:/var/lib/landscape/client/package/binaries ./ Packages
Get:4 file:/var/lib/landscape/client/package/binaries ./ Translation-en_US
Ign:4 file:/var/lib/landscape/client/package/binaries ./ Translation-en_US
Get:5 file:/var/lib/landscape/client/package/binaries ./ Translation-en
Ign:5 file:/var/lib/landscape/client/package/binaries ./ Translation-en
Get:3 file:/var/lib/landscape/client/package/binaries ./ Packages
Ign:3 file:/var/lib/landscape/client/package/binaries ./ Packages
Get:4 file:/var/lib/landscape/client/package/binaries ./ Translation-en_US
Ign:4 file:/var/lib/landscape/client/package/binaries ./ Translation-en_US
Get:5 file:/var/lib/landscape/client/package/binaries ./ Translation-en
Ign:5 file:/var/lib/landscape/client/package/binaries ./ Translation-en
Get:3 file:/var/lib/landscape/client/package/binaries ./ Packages
Ign:3 file:/var/lib/landscape/client/package/binaries ./ Packages
Get:4 file:/var/lib/landscape/client/package/binaries ./ Translation-en_US
Ign:4 file:/var/lib/landscape/client/package/binaries ./ Translation-en_US
Get:5 file:/var/lib/landscape/client/package/binaries ./ Translation-en
Ign:5 file:/var/lib/landscape/client/package/binaries ./ Translation-en
Get:3 file:/var/lib/landscape/client/package/binaries ./ Packages
Ign:3 file:/var/lib/landscape/client/package/binaries ./ Packages
Get:4 file:/var/lib/landscape/client/package/binaries ./ Translation-en_US
Ign:4 file:/var/lib/landscape/client/package/binaries ./ Translation-en_US
Get:5 file:/var/lib/landscape/client/package/binaries ./ Translation-en
Ign:5 file:/var/lib/landscape/client/package/binaries ./ Translation-en
Get:3 file:/var/lib/landscape/client/package/binaries ./ Packages
Ign:3 file:/var/lib/landscape/client/package/binaries ./ Packages
Get:4 file:/var/lib/landscape/client/package/binaries ./ Translation-en_US
Ign:4 file:/var/lib/landscape/client/package/binaries ./ Translation-en_US
Get:5 file:/var/lib/landscape/client/package/binaries ./ Translation-en
Ign:5 file:/var/lib/landscape/client/package/binaries ./ Translation-en
Get:3 file:/var/lib/landscape/client/package/binaries ./ Packages
Ign:3 file:/var/lib/landscape/client/package/binaries ./ Packages
Get:4 file:/var/lib/landscape/client/package/binaries ./ Translation-en_US
Ign:4 file:/var/lib/landscape/client/package/binaries ./ Translation-en_US
Get:5 file:/var/lib/landscape/client/package/binaries ./ Translation-en
Ign:5 file:/var/lib/landscape/client/package/binaries ./ Translation-en
Get:3 file:/var/lib/landscape/client/package/binaries ./ Packages [847 B]
Get:4 file:/var/lib/landscape/client/package/binaries ./ Translation-en_US
Ign:4 file:/var/lib/landscape/client/package/binaries ./ Translation-en_US
Get:5 file:/var/lib/landscape/client/package/binaries ./ Translation-en
Ign:5 file:/var/lib/landscape/client/package/binaries ./ Translation-en
sudo ls -altr /etc/apt/sources.list.d
total 24
drwxr-xr-x 8 root root 4096 Apr 26 09:50 ..
drwxr-xr-x 2 root root 4096 May 8 09:54 .
-rw-r--r-- 1 root root 121 May 13 13:26 microsoft-ubuntu-prod.list
-rw-r--r-- 1 root root 71 May 13 13:26 _landscape-internal-facade.list
The version of landscape- client/ jammy,now 19.12-0ubuntu13 amd64 [installed]