[gutsy] cdromupgrade errors on nvidia-glx

Binary package hint: nvidia-glx

While performing cdromupgrade from mounted gutsy alternate iso, there is an error generated:
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Could not install '/var/cache/apt/archives/nvidia-glx_1%3a1.0.9639+2.6.22.4-14.9_i386.deb'

The upgrade will continue but the '/var/cache/apt/archives/nvidia-glx_1%3a1.0.9639+2.6.22.4-14.9_i386.deb' package may be in a not working state. Please consider submitting a bugreport about it.

subprocess pre-installation script returned error exit status 2
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/var/log/dist-upgrade/main.log reports:

...
2007-11-06 18:58:54,221 WARNING envy detected, trying to workaround

2007-11-06 18:58:54,221 DEBUG found non-downloadable 'nvidia-glx'

2007-11-06 18:58:54,223 INFO Forcing downgrade of 'nvidia-glx' because of envy

2007-11-06 18:58:54,434 INFO Forcing downgrade of 'nvidia-glx' because of envy

...

/var/log/dist-upgrade/term.log reports:

...
dpkg - warning: downgrading nvidia-glx from 1:100.14.12 to 1:1.0.9639+2.6.22.4-14.9.

Preparing to replace nvidia-glx 1:100.14.12 (using .../nvidia-glx_1%3a1.0.9639+2.6.22.4-14.9_i386.deb) ...

dpkg-divert: `diversion of /usr/lib/xorg/modules/libglx.so to /usr/lib/nvidia/libglx.so.xlibmesa by nvidia-glx' clashes with `diversion of /usr/lib/xorg/modules/extensions/libglx.so to /usr/lib/nvidia/libglx.so.xlibmesa by nvidia-glx'

dpkg: error processing /var/cache/apt/archives/nvidia-glx_1%3a1.0.9639+2.6.22.4-14.9_i386.deb (--unpack):

bglx.so.xlibmesa by nvidia-glx' clashes with `diversion of /usr/lib/xorg/modules/extensions/libglx.so to /usr/lib/nvidia/libglx.so.xlibmesa by nvidia-glx'

 /var/cache/apt/archives/nvidia-glx_1%3a1.0.9639+2.6.22.4-14.9_i386.deb

...

dpkg -I reports:

 new debian package, version 2.0.

 size 4493184 bytes: control archive= 3548 bytes.

    1215 bytes, 23 lines control

    1751 bytes, 25 lines md5sums

     275 bytes, 13 lines * postinst #!/bin/sh

    3277 bytes, 80 lines * postrm #!/bin/sh

    5921 bytes, 128 lines * preinst #!/bin/sh

    1100 bytes, 45 lines * prerm #!/bin/sh

     128 bytes, 4 lines shlibs

 Package: nvidia-glx

 Source: linux-restricted-modules-2.6.22 (2.6.22.4-14.9)

 Version: 1:1.0.9639+2.6.22.4-14.9

 Architecture: i386

 Maintainer: Ubuntu Kernel Team <email address hidden>

 Installed-Size: 13352

 Depends: nvidia-kernel-1.0.9639, linux-restricted-modules-common, xserver-xorg-core (>= 1:0.99.0-1), libglu1-mesa | libglu1, libatk1.0-0 (>= 1.13.2), libc6 (>= 2.6-1), libglib2.0-0 (>= 2.14.0), libgtk2.0-0 (>= 2.12.0), libpango1.0-0 (>= 1.18.2), libx11-6, libxext6

 Suggests: nvidia-kernel-source (>= 1.0.9639)

 Conflicts: nvidia-glx-src, nvidia-settings, nvidia-xconfig, nvidia-glx-legacy, nvidia-glx-new

 Replaces: nvidia-glx-src

 Provides: xserver-xorg-video
...