Could have a look at 

https://www.unixmen.com/quick-tip-fix-gpg-error-badsig-linux-mint-ubuntu/

-Larry

> On Dec 1, 2016, at 2:38 AM, joe@actionline.com wrote:
> 
> Found a further (still partial) solution to the problem
> that I reported here a few minutes ago.
> 
> https://forums.linuxmint.com/viewtopic.php?t=221151#p1161682
> 
> However, the problem with the top window in the synaptic
> "Update Manager" (as shown in the screen shot link below)
> has gotten even worse (the window gets smaller and smaller
> every time I open synaptic), to the point that this top
> window is now so small that nothing that might be in that
> window can even be seen.
> 
> http://upquick.com/temp/synaptic1.jpg
> 
> What can I do to fix this problem?
> 
> 
> 
> 
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