The latest version of Synaptic can be downloaded from Softpedia
Synaptic Package Manager 0.81.1 was announced on May 10 by its author, Michael Vogt, and it brought a few updates, fixes and some code cleanup.Michael Vogt, the lead developer for APT team for Debian and a software developer at Canonical, has deemed the Synaptic 0.81.1 package to be unstable, at least for now.
According to the changelog, the application no longer crashes when the Xapian search is triggered when view is not ready, Iceweasel is now used as fallback if xdg-open fails, and Synaptic no longer crashes when a sources.list entry is removed.
Also, the topmost filter is no longer changed when the user is reopening the filter settings, the copy constructor has been fixed in order to avoid the incorrect reading of the and/or mode value, and a memory leak in the copy/restore filter has been fixed.
Synaptic is a graphical package management program for apt. It provides the same features as the apt-get command-line utility with a GUI front-end based on GTK+. Most importantly, users can install, remove, upgrade and downgrade single and multiple packages.
More details about this release can be found in the official changelog. You can also download Synaptic 0.81.1 right now from Softpedia.