BBB disconnect with USB hub automatically

Hi everyone,

I have installed ubuntu 12.04 in BBB on SD card, when I connect the usb hub to BBB for using mouse, keyboard, it works well. However about some minutes later, mouse and keyboard dont work any more, I can not type and manipulate mouse. I disconnect the hub and reconnect to BBB, then it work normally.

Anyone knows the reason ?

Thanks in advance !

That ubuntu image has a known buggy kernel, upgrade to something
actually supported...