When I open the GNOME Software Center, the following error is displayed:
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The issue was more nuanced.
As @ vgaetera pointed out, the error message is caused by PackageKit being masked, and I now remembered why I masked PackageKit, in order to disable automatic updates, following this thread.
So, since I don’t want automatic updates, I guess I have to keep PackageKit masked and live with the error message in GNOME Software Center.
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