[Replying to a post from September...]
The "cannot initialize opengl" is bug
http://bugs.winehq.org/show_bug.cgi?id=14045
The workaround is to set a registry key to tell sketchup your graphics card is
ok.
See
http://wiki.winehq.org/GoogleSketchup
for more tips.
Caveat: your Asus EAX1650Pro graphics card is ATI-based,
and I haven't heard any success stories yet running Sketchup on ATI graphics
cards.
Also, your OS (Ubuntu 6.06) is awful old, and probably has very outdated
opengl drivers. You may have better luck with Ubuntu 8.10.
Let us know how it goes!