First, thanks to www.weesk.com for the background collection !

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48 Wallpapers with 30 minutes cycling = 24h of beauty

Uncompress the archive and double-clic on "install.sh".

Or copy the 24h folder to the directory :

/usr/share/backgrounds/

and the 24h.xml file to the directory :

/usr/share/gnome-background-properties/

8-)

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1.2 : Change from stretched to zoom default screen adaptation.