Created attachment 50267 [details]
installation screen

What do you mean exactly? The tabs are working correctly, both in graphical and
curses-mode.

Yes, but they are missing these so called shortcuts or keyboard accelerators (=
underlined letters).  In graphical mode you cannot press Alt-O or Alt-E to
switch to the other tab.

OK, did not get that before. So this would be an enhancement, because it does
not pretend there are shortcuts.

This sounds like a general problem of the DumbTab widget (I just checked 
bootloader, which has shorcuts defined, and the behavior is the same - in 
NCurses, shortcuts are there, in QT not). Stefan? 

Those tabs intentionally don't have shortcuts since those shortcuts would have to 
be unique in _all_ the tabs. Upon switching tabs, all the sortcuts would have to 
be rearranged - which would be very awkward (the tab implementation of the 
NCurses UI does that, and this could be considered a bug). This is why those tabs 
don't have (and will not get) shortcuts. This used to be one more reason against 
using tabs in the first place, but I was overruled with that. Now we have to live 
with the side effects. 
 
Besides, not all widgets are required to have keyboard shortcuts - those 
shortcuts are, as the name implies, only a shorter way to activate the 
corresponding widgets. You can always use the [Tab] key to move the keyboard 
focus and then activate the widget (usually with the [Space] key). 

*** Bug 304171 has been marked as a duplicate of this bug. ***

*** Bug 383426 has been marked as a duplicate of this bug. ***