Please follow these steps:
1) Make a backup of your xorg.conf
sudo cp /etc/X11/xorg.conf /etc/X11/xorg.good

2) type:
python /usr/share/screen-resolution-extra/policyui.py 2048x2048

Click on "yes" when the 1st window shows up and then enter your password
in the second dialog.

3) type:
grep -i virtual /etc/X11/xorg.conf

and attach its output

4) Restore your backup:
sudo cp /etc/X11/xorg.good /etc/X11/xorg.conf

-- 
gnome-display-properties hangs when trying to set VirtualScreen size
https://bugs.launchpad.net/bugs/446199
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