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I have an odd problem. I have tried to use Synaptic so I can install a package. The system asks for the root password but won't accept it. I can start a terminal window and start su with the root password and start Synaptic in su and it comes just fine. The same for Apper except it won't start in su for GUI reasons.

What must I do to correct this?

I am using Debian 9 stretch with KDE.

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  • Are you trying to run synaptic with sudo? Either way I'm guessing it's trying to use sudo. In which case it's actually prompting for your user password and not the root password. It could also be that your user is not an authorized sudoer. Commented Dec 23, 2017 at 20:12
  • To run Apper in recent Kubuntu I need to use env 'DISPLAY=$DISPLAY' 'XAUTHORITY=$XAUTHORITY' KDE_SESSION_VERSION=5 KDE_FULL_SESSION=true apper Commented May 12, 2023 at 11:54

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Privileged users can run synaptic through:

$ synaptic-pkexec

It will prompt for user password.

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