I did see the exact same things already being discussed here:
ATV2 Firmware 4.3.1 & untethered JB & XBMC compiled April 1'st
- Sound issues
- Samba/SMB issues
- Saurik.list empty (etc/apt/sources.list.d) -causing seatbeltunlock -bsdiff & GAWK dependency issues
ATV2 Firmware 4.3.1 & tethered JB (Seas0npass) & XBMC compiled April 1'st
- NO Sound issues
- NO Samba/SMB issues
- A number of other repos residing in /etc/apt/sources.list.d
I also tried to #cp the entire "/etc/apt" directory over to the untethered installation, and tried with an apt-get update/upgrade, before applying the XBMC installation once again.
The outcome from that was still XBMC being fubar. I do wonder if we are just missing out an unseen deb file not being installed.