terminal doesn't export its own menu on a new install

[Didier Roche]

New wily install from iso (french selected) on the 21/10/2015. Disk wiped.

After install, first login:
1. Open a terminal with ctrl + alt + t (the same happens if started from the dash with <super> + terminal<enter>)
-> see that "Terminal" single entry menu is exported on the top unity panel.
However: the other menu entries ("File", "Edit"…) are present, but not exported (see attachment)

2. right-click and unselect show menubar
-> the "Terminal" single entry is still exported, and as expect, the menu bar doesn't appear

3. if you reenable it, you are back to state 1.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: gnome-terminal 3.16.2-1ubuntu4
ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
Uname: Linux 4.2.0-16-generic x86_64
ApportVersion: 2.19.1-0ubuntu3
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Oct 21 09:21:01 2015
InstallationDate: Installed on 2012-05-28 (1240 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
SourcePackage: gnome-terminal
UpgradeStatus: Upgraded to wily on 2014-10-31 (354 days ago)