After unpacking 26.0MB of additional disk space will be used.
(Reading database ... 134965 files and directories currently installed.)
Unpacking nvidia-glx-new (from .../nvidia-glx-new_1.0.9755+2.6.20.5-15.20_amd64.deb) ...
dpkg: error processing /var/cache/apt/archives/nvidia-glx-new_1.0.9755+2.6.20.5-15.20_amd64.deb (--unpack):
 trying to overwrite `/usr/bin/nvidia-xconfig', which is also in package nvidia-xconfig
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Errors were encountered while processing:
 /var/cache/apt/archives/nvidia-glx-new_1.0.9755+2.6.20.5-15.20_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)