I have since upgraded to 8.04, where the side buttons worked out of box (mostly), but they didn't work in Firefox 2 when I downgraded. I hope it still helps.
** Attachment added: "Xorg.0.log" http://launchpadlibrarian.net/15856591/Xorg.0.log -- Need input-hotplug - Microsoft IntelliMouse Explorer 3.0 not installed correctly https://bugs.launchpad.net/bugs/107876 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs