Package: apper Version: 1.0.0 I think I had this same problem already long ago sometimes and whenever it happened just used apt-get install instead of Apper (which works without any issues). I'm using Debian12 with KDE.
The full error message in the box that plops up after confirming the packages to install is: >You have failed to provide correct authentication. >Please check any passwords or account settings. >Details >Failed to obtain authentication SDDM is version 0.19.0-5 polkit-kde-authentication-agent-1' process is running unattended-upgrades is not running and not installed anymore apt is not running, Discover is not running (only discover-notifier) The error is from apper.lib PackageKit at RoleInstallPackages and other messages in the console are basically just "kf.widgetsaddons: Invalid pixmap specified." Also see https://bugzilla.redhat.com/show_bug.cgi?id=1004323
