Apt does support downgrading already.
Its just a bit hidden. Use apt-get install pkg=version. E.g.:
apt-get install gnome-panel=1:2.18.1-0ubuntu3 gnome-panel-common=1.2-0ubuntu3
...
Note that the dependency reoslver will not downgrade automatically so
you will have to specify some dependenceies.
** Changed in: apt (Ubuntu)
Status: Unconfirmed => Fix Released
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apt-get should allow downgrade also
https://bugs.launchpad.net/bugs/107221
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