I just upgraded to Lubuntu 12.04 yesterday. One annoying little quirk so far. Sometimes it won't react to my wireless trackball when I start the computer. If I take the USB connector out and then put it back in, it works fine. That didn't happen before with Lubuntu 11.10.
I have a Logitech M570 wireless trackball, with a Unifying wireless connector. I prefer using this for my Toshiba Satellite A100 that I have Lubuntu installed on. I often turn it off to prolong battery life; although that's probably not necessary.
Should I just leave it on all the time to make sure it starts properly? Or should I only turn the trackball off when the computer's powered down and then turn it on before booting up?