Unpacking xbian-update (from .../xbian-update_1.0-0.5_armhf.deb) ...
!-------------------------------------------------!
!                                                 !
! Please install this update on XBian 1.0 Alpha 4 !
!                                                 !
!-------------------------------------------------!
dpkg: error processing /var/cache/apt/archives/xbian-update_1.0-0.5_armhf.deb (--unpack):
 subprocess new pre-installation script returned error exit status 1
Errors were encountered while processing:
 /var/cache/apt/archives/xbian-update_1.0-0.5_armhf.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)