Ubuntu – ubuntu does not show its GUI interface after installing virtualbox-guest-x11

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I am trying to use my Ubuntu on windows Virtualbox. With reference to this page (http://lifehacker.com/how-to-dual-boot-and-virtualize-the-same-partition-on-y-493223329), I managed to boot up Ubuntu as a guest OS on my Virtualbox.

Then I wanted to change the resolution of the screen, so I installed virtualbox-guest-x11 using apt-get install.

sudo apt-get install virtualbox-guest-x11

After this, I tried to restart the machine, but ubuntu would not show it's GUI interface. After I choose Ubuntu on the GRUB bootloader, the screen goes black/purple. At first I thought it did not boot at all, but I was able to log in on command prompt by pressing Ctrl+Alt+F3. It's just the GUI that is not loading. 

sudo service lightdm start

returns

start: Job failed to start

I removed the package I installed for the last time, but the problem has not been fixed.

Any help would be appreciated.

Best Answer

Try one of this:
 Press Ctrl+Alt+F7 to launch the GUI interface
From the terminal change your desired resolution with:
xrandr -s 1024x768 where 1024x768 is your desired resolution and reboot the system by:
sudo reboot Waiting for your response.

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