Hello,
I am new here, and i was wondering if someone experience, runing cgminer under ubuntu 12.04/10/13.04/10 using both, the newly antminer u1 and block erupter's (on the same hub) and multiple cgminer instances.
You shouldn't need multiple instances of cgminer. The current version of cgminer works fine with both of these devices at the same time by default without any special flags or multiple instances.