We do not provide pre-compiled binaries for Linux, only source code.
As I said, your best choice is to purge that PPA, go back to Canonical-only sources and then you can (hopefully) install Ubuntu’s 2.1.2 packaged version of Audacity.
If you must use 2.1.3-alpha, you will have to accept issues like that Device Toolbar with no dropdown menu. The best way to use 2.1.3-alpha is to clone it from our git sources and build it yourself. You could do the same as Building Audacity 2.1.2 on Ubuntu 15.10 except that you would get our git sources and not the 2.1.2 release tarball.
Gale