I'm afraid this doesn't qualify for blocker status, but it should be at least NTH.

I don't know that there's a live environment agnostic way of disabling the "super menu", and I would hate to have to come up with a different fix for each live CD we make.  If you know of an idea, I'd be happy to consider it.

Disabling SIGTERM while we're writing to disk is an interesting idea that we'll have to talk over.  There's got to be some unforseen consequences of doing that.

I agree it is a bad idea to make hacks to different DEs to disable their window-close capabilities. Fortunately this should be much simpler. The window might decide just to ignore the signal, whether it is SIGTERM or some GTK window-close signal (I don't know, I never worked with GTK). That is a reasonable behavior during installation and works consistently across all DEs.

There is nothing wrong on ignoring SIGINT/SIGTERM, a lot of programs do it. E.g. rpm will not quit immediately you press Ctrl+C, but first it will make the system consistent (close the database handles, release the locks etc) and only then it will quit. LibreOffice will ask you "Do you want to save the document before quitting?". Anaconda should do the same - make sure it doesn't leave the system in an inconsistent state (half installed).

If you receive such event, you can even pop up a dialog "The installation is in progress, please don't try to close the installer now". User can always kill the process, of course.

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The window closing part is fixed, we already ignore SIGINT, SIGTERM is more complicated. We might be able to handle that better.

Great, handling window closing was the most important in my opinion. Handling other signals is nice, but you don't usually send them by accident, I suppose. So from my POV, this bug can be closed :) Thanks.

Sounds good to me.