There are many regression in the 5.x version of unity-2d.
1) No global menu anymore in Unity2D, wich was working in 11.10 (unity4) with 
same hardware
2) No way to enable auto-hide of the dock panel (always show is the only viable 
option for me, when selecting other option there is no panel at all)
3) I'm using old hardware with nvidia-173 drivers and I don't like the fact 
"composite" is mandatory to use Unity correctly (very laggy) I had to force 
composite to "off" to avoid laggy windows by modifying /etc/X11/xorg.conf:

Section "Extensions"
    Option             "Composite" "Disable"
EndSection

Notes:
Not directly related with Unity but nvidia-173 drivers are not compatible with 
Xorg version released in 12.04. So I stick with 11.10 version of Xorg. I had to 
make the following changes to backport Xorg:

In /etc/apt/sources.list :

Package: xserver-xorg*
Pin: release a=oneiric
Pin-Priority: 1050

In /etc/apt/preferences:

deb http://fr.archive.ubuntu.com/ubuntu/ oneiric main
deb-src http://fr.archive.ubuntu.com/ubuntu/ oneiric main

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https://bugs.launchpad.net/bugs/944865

Title:
  regression: no dock or menu bar after login

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