Automatic Updates

I just did a basic install of ClamTK in Ubuntu 20.04. Thanks. It seems to be working fine and I have scanned several directories using "Scan a directory".

The "Virus Scanner" window does show "An update is available." Apparently the default is to automatically receive updates which is fine. But then any of my attempts to set times in the Scheduler come back as zero.

I am the user and group for ~/.clamtk and its contents, however the install was done as sudo. A plain "clamtk" from the command line just launches the GUI.

What am I missing?