Iḿ really satisfied with ubuntu, but for job necessities I need Windows too.
The problem for me appears when I change from ubuntu to windows7, the time is incorrect and take a lot of time to adjust itself using internet services.
Related with the time: Iĺl try to explain myself:
I am using linux, but meanwhile I need to use windows and I restart the system to boot into windows. Thereś no problem with this, but the time is incorrect.
When I am using linux, the time is correct, but if I restart to use windows, windows time is incorrect