The only reason I can think of why the AppImage would not work for you (the AppImage is created using Ubuntu after all) is that you failed to make it executable after downloading it. You should be able to do that be right-clicking the AppImage and finding the "properties" tab (this will vary visually depending on your particular Desktop Environment) and checking the executable box.
Once that's done, it's simply a matter of double-clicking the AppImage to launch it (and making sure the "Use bundled Python" box is checked in Sigil's plugin preferences before trying any plugins).
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