Sonic Visualiser

Tested in a VM (god, Ubuntu is horrible by default) and confirmed.

Installing the Qt5 packages through apt-get install qt5-default gets us packages that can be used to build SV, but running it produces a window with no menu bar.

The menubar is missing from the app window regardless of which desktop environment we're using -- with Unity you get the single menubar at top of screen, which is the expected behaviour there; with Gnome or XFCE4 you don't get that, but you still don't get a menubar on the application window.

There does appear to be a workaround for the end-user: uninstall the package appmenu-qt5. (Note: not appmenu-qt which is for Qt4.)

Without this package installed, SV shows a menubar on the application window regardless of which desktop environment is in use (i.e. it also no longer follows the Unity single-menubar style when running under that desktop).

A programmatic alternative, according to e.g. this forum post, is to call menuBar()->setNativeMenuBar(false); from the application code. We could do that as standard in Linux builds, at the cost of losing single-menubar support for every user of SV regardless of desktop environment (potentially disastrously alienating the two people in the world who actually like the way Unity tries to do things).

Fixed in 8b51bfe70625 using the setNativeMenuBar workaround.