In reply to #13 above, the version on 16.04 is *not* 3.6, but rather 3.4+nmu1ubuntu2 (xenial). Version 3.6, as noted at #7 above, uses a set of 9 alternative paths, rather than the single path of 3.4.
The solution that has been adopted for multiple installs of Ubuntu, 14.04 and 16.04 is to install the Debian version immediately after the base Ubuntu install. The procedure has worked, so far, but is ugly. The necessity of doing this does little for the good reputation of Ubuntu as offering "just works" software.
In reply to #13 above, the version on 16.04 is *not* 3.6, but rather 3.4+nmu1ubuntu2 (xenial). Version 3.6, as noted at #7 above, uses a set of 9 alternative paths, rather than the single path of 3.4.
The solution that has been adopted for multiple installs of Ubuntu, 14.04 and 16.04 is to install the Debian version immediately after the base Ubuntu install. The procedure has worked, so far, but is ugly. The necessity of doing this does little for the good reputation of Ubuntu as offering "just works" software.