Install ubuntu n problems, first, because double graphics driver has a problem, install the driver, and then there is the log folder, quickly leave/directory is full, the reference after some cleanup files online seems to be ok, and then there are the boot code has been at the interface, and has been running code, very meng, do you have any friends also encountered such a problem, ask how to solve, ps, found that the situation is schrodinger's cat, sometimes there is sometimes no, please grant instruction