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This question already has an answer here:

My virtualbox running ubuntu 14.04 but seep is very slow.

Virtualbox: 4.3.10 Ubuntu: 14.04 Virtualbox addon: 4.3.10

I have tried suggestion from post: Why does a Ubuntu guest in VirtualBox run very, very slowly?

But doesn't work.

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marked as duplicate by karel, Takkat, bain, Eric Carvalho, Warren Hill Jul 19 '14 at 13:23

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    Finally I followed [@Gordon Glas]'s comments in post to install new virtualbox addon and issued fixed. Steps I have done: [0]/usr/lib/nux/unity_support_test -p [1]sudo apt-get install linux-headers-$(uname -r) build-essential [2]Install addon [VBoxGuestAdditions_4.3.13-93885],virtualbox.org/download/testcase/… [3]/usr/lib/nux/unity_support_test -p – Amitabha Jul 17 '14 at 4:42
  • Sorry but I think they are different. Because I still want to use Unity 3D GUI. – Amitabha Jul 17 '14 at 7:04
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    Only the last section on "GNOME flashback" of my answer there is a solution for people who's hardware is not capable of running Unity 3D. All other steps are for speeding up Unity3D. – Takkat Jul 17 '14 at 7:24
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If your Ubuntu uses Unity, then it is natural Ubuntu runs very slow in Virtualbox. Ubuntu and Unity is very heavy, especially on low RAM. So the solution is vary, one of them is changing your Unity into another lightweigth user interface such as XFCE, LXDE, or even Openbox.

How To Install XFCE

How can I install XFCE along side unity?

How To Install LXDE

How do I install LXDE / Lubuntu?

How To Install Openbox

http://linuxg.net/how-to-install-openbox-on-ubuntu-13-10-13-04-12-10-12-04-and-linux-mint-15-14-13/

The Google keyword for these is how to install ubuntu.

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