mouse buttons only respond when they pressed sepertly after upgrade to 8.10

This sounds like like your mouse might configured for three button emulation. If you simultaneously click left and right mouse button, the response is middle mouse button.

Please check to see if that is the case. If you are running compiz, it is easy to check - middle mouse will activate cube rotation, see if clicking both mouse buttons does the same. Please tell.....

yes
that it the problem
how do I cancel this?
thank you alot

yes
that it the problem
how do I cancel this?
thank you alot

I am working on this problem myself

This used to be configurable through xorg.conf, but that has been deprecated in intrepid. It must be configured through HAL now, and I haven´t quite figured out how to do this. I have also request help on this issue.

I have found a temporary workaround by issuing a command at startup, this is the form of this command
xinput set-int-prop <device_name> <property> <format> <value>

To try with workaround, first determine what the id number of your mouse
xinput list

For me, I get id=4, so I use this command, where 4 is the device_name, "Middle Button Emulation" is the property, 8 is the format parameter, and 0 is the value. So the command that works for me is:
xinput set-int-prop 4 "Middle Button Emulation" 8 0

Hopefully I will find a more elegant and permanent solution.

thank you for the solution
please let me know if you will find better solution

Might be this helps...

Taked from http://www.ubuntu.com/getubuntu/releasenotes/810

" The X.Org configuration file (/etc/X11/xorg.conf) still has InputDevice entries for the mouse and keyboard, but they are ignored now because input-hotplug is used. The keyboard settings now come from /etc/default/console-setup; to change them please use sudo dpkg-reconfigure console-setup. After that, HAL and X need to be restarted (e.g., by rebooting your system). "

thank you very much
This solution fixed my problem

Thanks Wyatt Smith, that solved my question.