I'm assuming it's a hardware issue, and an old one anyway. Open a new bug if you can reproduce with another mouse on a current release.
** Changed in: xserver-xorg-input-mouse (Ubuntu) Status: Confirmed => Invalid -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-input-mouse in Ubuntu. https://bugs.launchpad.net/bugs/124146 Title: Intermittent focus problems To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kdebase/+bug/124146/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp