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I tried many ways to make a bigger screen in VirtualBox because I do not like the small size of the guest window? Is there is a way to make it big?

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View -> Switch to Fullscreen Mode (or HOST+F)

Right CTRL is normally the default HOST key.

You need to install the Guest Additions to be able to adjust the guest screen geometry to the host in fullscreen mode.

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For me this just makes the VirualBox instance fullscreen, not the cilent computer (there are grey borders on each side of the client OS's screen, which is as big as before HOST+F) – lindhe Nov 9 '13 at 15:34
From within the virtual machine, try adjusting the resolution? ie: In Windows, go to Control Panel and set your resolution. – earthmeLon Nov 12 '13 at 18:54
Does not help - it does not show the resolution of my physical screen as maximum, but some "preset" or virtually defined one. Maybe I should set a screen resolution in the VB settings for that machine? – lindhe Nov 12 '13 at 21:22
Correct answer is to install Guest Additions:… – gspatel Apr 20 '14 at 8:26

You need to install the Guest Additions go to devices menu > select "install guest additions" after installation restart virtual system now select view menu and click "switch to full screen"

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You should run the following commands in a terminal on your host Ubuntu session:

sudo apt-get remove libcheese-gtk23
sudo apt-get install xserver-xorg-core
sudo apt-get install virtualbox-guest-x11
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What do they do? – Mukus Aug 19 '15 at 0:03

if using virtual box to use ubuntu on any other host.

  1. Start the virtual machine, when ubuntu is booting up switch of virtual machine immediately.
  2. Start the machine again, and when ubuntu prompts some boot up options, select the first one...
  3. Your Ubuntu will start with a bigger screen size in comparison to the older one.
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