Thanks for your report.
The relevant error is --- Unpacking fglrx (from .../fglrx_2%3a8.721-0ubuntu7_i386.deb) ...
dpkg-divert: mismatch on package
when removing `diversion of /usr/lib/xorg/modules/extensions/libdri.so to /usr/lib/fglrx/libdri.so.xlibmesa by fglrx'
found `diversion of /usr/lib/xorg/modules/extensions/libdri.so to /usr/lib/fglrx/libdri.so.xlibmesa by xorg-driver-fglrx'
dpkg: error processing /var/cache/apt/archives/fglrx_2%3a8.721-0ubuntu7_i386.deb (--unpack):
subprocess new pre-installation script returned error exit status 2
Thanks for your report.
The relevant error is 2%3a8.721- 0ubuntu7_ i386.deb) ...
---
Unpacking fglrx (from .../fglrx_
dpkg-divert: mismatch on package
when removing `diversion of /usr/lib/ xorg/modules/ extensions/ libdri. so to /usr/lib/ fglrx/libdri. so.xlibmesa by fglrx'
found `diversion of /usr/lib/ xorg/modules/ extensions/ libdri. so to /usr/lib/ fglrx/libdri. so.xlibmesa by xorg-driver-fglrx'
dpkg: error processing /var/cache/ apt/archives/ fglrx_2% 3a8.721- 0ubuntu7_ i386.deb (--unpack):
subprocess new pre-installation script returned error exit status 2