Configuring with dconf or gconf as suggested in this post worded on Ubuntu Gnome 13.10 (I tried and succeeded). But does NOT work on Ubuntu Gnome 14.04.
How to change auto-save-directory of gnome-screenshot on Ubuntu Gnome 14.04?
Configuring with dconf or gconf as suggested in this post worded on Ubuntu Gnome 13.10 (I tried and succeeded). But does NOT work on Ubuntu Gnome 14.04.
How to change auto-save-directory of gnome-screenshot on Ubuntu Gnome 14.04?
after reading this article and this question it seems like in Ubuntu-Gnome 14.04 (gnome 3.10) the screenshots with Keyboard shortcuts eg:Print are handle by the shell (gnome-settings-daemon media-keys) saving the files to ~/Pictures and not by the gnome-screenshot application.
I have installed Ubuntu Gnome 14.04 to test it.
1) I set the auto-save-directory to /tmp:
gsettings set org.gnome.gnome-screenshot auto-save-directory '/tmp'2) I disable the keyboard shortcut Print and I created a new one to run the gnome-screenshot command with the shortcut Ctrl+Alt+H . Then I pressed the new shortcut and the screenshot appears in the /tmp directory.



So, set the auto-save-directory value works for gnome-screenshot, but to solve this issue you can try to disable the default keyboard shortcuts for Screenshots and create new ones but running the gnome-screenshot command.
Whole screen: gnome-screenshot
Grab a window: screen gnome-screenshot -w
Grab an area: screen gnome-screenshot -a
Send the grab to the clipboard: gnome-screenshot -c
Interactive: gnome-screenshot -i
You can set the directory with the dconf command.
In this example I'm going to set my Downloads directory.
dconf write /org/gnome/gnome-screenshot auto-save-directory \'/home/youruser/Downloads\'
Please put the full path to the folder... My case /home/virtual/Downloads


Just install dconf-editor:
sudo apt-get install dconf-editor
Open dconf-editor and edit the auto-save-directory field (see screenshot below):
org > gnome > gnome-screenshot