Desktop shows a white or black background instead of wallpapers

I tried this and it worked!

gsettings set org.gnome.settings-daemon.plugins.background active true

Having the same problem.

A workaround I've found through random clicking is to turn on desktop icons.

This can be done with dconf-editor or ubuntu-tweak-tool. The second is the easiest:

sudo apt-get install ubuntu-tweak-tool

Then launch it from the menu.

Under System/Desktop Icons you'll find a toggle to enable icons on the desktop. Switch this on, and suddenly -- wallpaper! This stays there if you turn off desktop icons but disappears again on login.

I've just allowed desktop icons to stay enabled, but simply any from my desktop.

Right click isn't working for me either...cause the desktop is not handled by file manager now.

Try doing reset of dconf/unity --reset... but it makes lose all your settings...I've found one link:

https://answers.launchpad.net/ubuntu/+question/217369

Maybe this can help.

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SOME DETAILS: (from link, with minor edit for clarity)

.. you can reset the settings from terminal. (CTRL+ALT+T).

or just Ctrl+Alt+F1.

"You will lose all of your settings .. even the background. .. apply the commands below one at time."

Check your spelling, and/or print this first.

gconftool --shutdown

sudo killall -r -I gconf
sudo killall -r -I dconf

rm -rf .compiz* .gconf* .config/dconf/ .config/compiz*

Restart PC

sudo shutdown -r now