No File, Edit, View, Print menus in Unity toolbar

There is no File, Edit, View, Print etc. menus available for use in the Unity top toolbar when running gthumb 3.4.3 for i386. Otherwise program functions as it should

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: gthumb 3:3.4.3-1
ProcVersionSignature: Ubuntu 4.4.0-43.63-generic 4.4.21
Uname: Linux 4.4.0-43-generic i686
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: i386
CurrentDesktop: Unity
Date: Sat Oct 15 03:19:05 2016
InstallationDate: Installed on 2016-06-10 (127 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release i386 (20160420.1)
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gthumb
UpgradeStatus: No upgrade log present (probably fresh install)