Preconfiguring packages ...
(Reading database ... 173063 files and directories currently installed.)
Preparing to replace xorg-driver-fglrx 8.16.20-1 (using .../xorg-driver-fglrx_8.22.5-1_i386.deb) ...
Unpacking replacement xorg-driver-fglrx ...
dpkg: error processing /var/cache/apt/archives/xorg-driver-fglrx_8.22.5-1_i386.deb (--unpack):
trying to overwrite `/usr/lib/libGL.so.1.2', which is also in package libgl1-mesa
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Errors were encountered while processing:
/var/cache/apt/archives/xorg-driver-fglrx_8.22.5-1_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)