Problem Upgrading Linux Lite 3.4

[mezzmer]

Thanks for the reply.  I'm not sure exactly what I did that got me through, but I just installed on top of the old installation, and then messed around with [tt]software-properties-gtk[/tt] until I got something that didn't produce any errors.  I'm not sure if I got all right lists.  Where/how can I find documentation on what the right list of PPAs for a default should be?  That doesn't seem like it should be a hard question. 

The biggest thing for me is preserving the desktop customizations.  Is there a way I can save and reload them?  Then I can just blow away the whole system and reload the desktop.