In case you want to ensure only specific applications are installed from XtraDeb.
There are several ways to do this. In this example, we configure apt to only install/update FreeFileSync from our repos.
sudo tee -a /etc/apt/preferences.d/xtradeb.pref <<EOF Package: * Pin: release o=LP-PPA-xtradeb-* Pin-Priority: -10 Package: freefilesync Pin: release o=LP-PPA-xtradeb-* Pin-Priority: 999 EOF
You can authorize additional apps by appending them in the “Package: freefilesync” line, comma separated.