Comment 3 for bug 157522

I had the same problem, under Feisty I had compiled Pidgin and after the upgrade to Gusty I had only the MySpace protocol.
Because pidgin looks plugins in the directory: /usr/lib/pidgin/ but there are installed in: /usr/lib/purple.
I fixed the problem by sudo cp /usr/lib/purple/* /usr/lib/pidgin/
I have a /usr/lib/purple-2/ containing a lots of plugins too.

Do you had pidgin installed before on Feisty ?I think that the problem comes from the replacement of the old Pidgin by the Pidgin from the repository.