Installing a newer package than listed in Synaptics?

[Frederick N. Brier]

I was installing the latest dovecot (v.2.0.13) as an IMAP server and ran 
into a bug (#873390) 
<https://bugs.launchpad.net/ubuntu/+source/dovecot/+bug/873390> that was 
fixed in release (1:2.0.15-1ubuntu2) and v2.1.  Synaptics is not showing 
that version.  I tried showing the pre-release packages, but it still 
did not show up.  Is there a trick to show new packages?

BTW, I have been using Fedora for the last several years and have used 
Debian, but recently installed Lubuntu.  I am just not familiar with the 
Synaptics Package Manager and Ubuntu package management.  Thank you.
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