the reason it was added back is:
"glade-3 (3.8.0-0ubuntu3) oneiric; urgency=low
* Add glade-gtk2 package to be able to create/edit gtk2 ui"
the new glade write gtk3 specific things in its .ui so they can't be
loaded by gtk2 softwares
** Changed in: glade-3 (Ubuntu)
Status: New => Inval
seems it was deleted from Oneiric and then added back during the cycle:
https://launchpad.net/ubuntu/oneiric/+source/glade-3/3.8.0-0ubuntu2
" * debian/control: Drop glade and glade-gnome, they are built by the "glade"
source package now. We keep this one to build libgladeui-1-{dev,11} for
