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APT error "Conflicting values set for option Signed-By regarding source"
Hi,
I suddently encountered this error on Discover while having done nothing for it to happen :
E: Conflicting values set for option Signed-By regarding source https://packages.mozilla.org/apt/ mozilla: /etc/apt/keyrings/packages.mozilla.org.asc != /etc/apt/keyrings/org.kde.neon.packages.mozilla.org.asc E: The list of sources could not be read.

What to do ?
PS : error 2 of 2 is identical to error 1 of 2.
Thanks

How to force GNOME apps to display KDE titlebar (even if GNOME titlebar remains, I don't care) ?
Because I customized KDE to show close/(un)maximize/minimize on the left and most importantly always on top on the right, except GNOME apps show only close and only on the right and the rest require a right-click, this is so annoying.
Basically, I want this :

To become this :

Thanks