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I downloaded a Debian Wheezy netinstall iso, and installed it with only the bare minimum applications and settings. I skipped over installing a display manager and window manager during installation.

I then added a Linux Mint backport repository and installed Cinnamon DE, and later installed gdm3 and lightdm. I don't know from which repository lightdm and gdm3 got installed.

Once I reboot my system after installation, I got to see that, there was a Debian Wheezy wallpaper at the grub menu, as well as,

/usr/share/backgrounds

and all the similar folders has Debian Wheezy wallpapers.

1) My question is, where from was these wallpapers installed. Was it there in the net-install iso, or was it part of gdm or lightdm ?

2) How do I remove those and add my own wallpapers? I do want to remove the default wallpapers, add mine, and how do I show my wallpapers in the setting ( right click--> change desktop background) ?

3) Since Cinnamon has a different settings unlike Gnome, when I choose to change the wallpapers, why is it that the wallpapers in /usr/share/backgrounds are not shown there ?

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