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In the artice below I described how to install XBMC on Apple TV 2.

http://arturito.net/2011/02/14/apple-tv-2-untethered-jailbreak-on-windows-and-xbmc-media-centre-installation/

Some users reported errors while installing XBMC on Apple TV 2.
In the step 5  where we go to NitoTV > Install Software > XBMC-ATV2

Apple TV 2 downloads XBMC, reboots and XBMC does not appear in the menu or this error appears:

E: dkg was interrupted, you must manually run ‘dpkg –configure –a’

To correct the problem follow these steps:

1. Find out the IP address of the APTV2 in Settings >Network
2. If you are on Windows download Putty http://the.earth.li/~sgtatham/putty/latest/x86/putty.exe (it is ssh client)
3. Launch Putty and in Host Name (or Ip Address) enter the IP address of Apple TV 2 for example 192.168.1.24
4. If you get message about encryption click Yes
5. You will get login screen. As user type in root and as password alpine
6. Launch the following command:

apt-get install wget
wget -O- http://apt.awkwardtv.org/awkwardtv.pub | apt-key add -
echo "deb http://apt.awkwardtv.org/ stable main" > /etc/apt/sources.list.d/awkwardtv.list
echo "deb http://mirrors.xbmc.org/apt/atv2 ./" > /etc/apt/sources.list.d/xbmc.list
apt-get update
apt-get install org.xbmc.xbmc-atv2

If by any chance you get error exit status 1

1. Run commands:

apt-get remove org.xbmc.xbmc-atv2
apt-get install org.xbmc.xbmc-atv2 --fix-missing

2. XBMC should appear in  Apple TV 2 Menu.

If you still get the problem the best idea is to do Restore thorugh iTunes and start the process again.

http://arturito.net/2011/02/14/apple-tv-2-untethered-jailbreak-on-windows-and-xbmc-media-centre-installation/

For some reason restore and installation worked for many.

Good Luck