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I installed VirtualBox-4.3.26 and after install unity is broken and Launcher and terminal are removed along with Software Center? My windows panel is not showing , for example my windows does not close and minimize and maximize.

How to restore my Desktop?

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Ok the problem could be that you may have installed package for different architecture from you OS architecture.

To check which architecture is your OS, write in terminal:

uname -a

Result for 32-bit Ubuntu:

Linux discworld 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:50 UTC 2011 i686 i686 i386 GNU/Linux

whereas the 64-bit Ubuntu will show:

Linux discworld 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:50 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

So after you know the correct architecture, first you need to remove the package that you have installed:

sudo apt-get purge virtualbox*

The download and install proper package:

For 32 bit OS virtualbox-4.3_4.3.26-98988~Ubuntu~raring_i386.deb

For 64 bit OS virtualbox-4.3_4.3.26-98988~Ubuntu~raring_amd64.deb

Possible duplicate as VirtualBox 4.3 on Ubuntu 13.10 breaks Unity and Terminal

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