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bbfa235
(Get the code!)
I got the same problem. This appeared when I did an update in 15.04. I thought that upgrading to 15.10 would solve the problem. So on and so forth.
I gave it a little test. If you know your mouse device in 'xinput --list' try to test it with xinput --test %id%' where %id% is your mouse device id in xinput. Leave that test run in a terminal window and open another terminal. In the second terminal cat the device input file into the terminal. On my system it's /dev/input/mouse0. Get the mouse events to stream into the terminal with 'sudo cat /dev/input/mouse0'.
Just to be clear, try these commands in two separate terminals:
xinput --test %id%
sudo cat /dev/input/mouse0
You'll notice that your mouse motions appear in both terminals in addition to the right button clicks. As for the left bottom clicks. Keep clicking the left mouse button and you'll notice that both terminals won't show the input event every now and then.
If this turns out to be the case for a lot of users that experience this problem. The error would have to be in the system and driver processes.
As for the broken mouse button. My mouse works fine in another installation of ubuntu 13.4? or 14.4? It's a wireless mouse and keyboard that connects to the usb port.