Last night I rolled a third beta for Koha 3.12.0. You can find both a tarball and a .deb package at
http://download.koha-community.org/
Please take some time to give it a spin and report any problems you might find.
Regards,
Jared
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Jared Camins-Esakov
Bibliographer, C & P Bibliography Services, LLC
(phone) +1 (917) 727-3445