Thanks much for the info about Flatpaks; good to know.
I did try to launch Sigil from the command line--same result. No nothing. Process list doesn't show it running. If I didn't do anything wrong in the download/install process, the reason could be a bug in this new Sigil version or in the Flatpak itself. My Linux distro does have a default version of Sigil, which is widely used, i.e., the outdated v. 1.1.0. I was wanting an upgrade to the latest version.
Guess I'll try to do the build and install Sigil myself according to a previous posting here that links to repository owner Doug Massay. Though I'm a Linux newbie, I did do a lot of stuff a long time ago from the MS-DOS command prompt.
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