Please after the Upgrade, I can no longer choose from "which Operating system" to use. Whenever I restart my laptop, Ubuntu now becomes my default Operating system and does not give me de Options to choose the OS to use at that moment. Plz help me.
答案1
If your machine is booting the "wrong" operating system, you may manually select what to boot. There are several possibilities, UEFI machines have a UEFI boot menu which may be invoked by some key (vendor specific, check the initial splash screen for info or the vendor's web site). From the UEFI menu, you may select Windows or ubuntu.
Grub may be forced to display by holding shift key or typeing esc repeatedly at boot time -- then select what to boot from the grub menu.