It seems related to pango1.0 instead. This behaviour occours in transition between versions 1.15.3-0ubuntu1 and 1.15.4-0ubuntu1 of libpango1.0-0. ** Changed in: gtk+2.0 (Ubuntu) Sourcepackagename: gtk+2.0 => pango1.0 -- accelerator keys gets 2 chars instead of one https://launchpad.net/bugs/80745