Wrong Windows

One of my computers dual-boots Ubuntu and Windows 7 (my wife has been using it and hasn’t noticed), I tried the free upgrade but on reboot it’s still looking for Windows 7 not 10. How can I restore the MBR so it can’t see Linux? I can then upgrade and restore Grub. John Warburton There is no need to restore the MBR, that will make your Linux installation unbootable. You can continue to dualboot with Windows 10. You are currently using

to boot, but it will not know that you have switched to Windows 10, so you need to tell it. Boot into Ubuntu, open a terminal and run $ sudo update-grub . This will scan your system for installed operating systems and pick up on Windows 10, so now you should see it in the boot menu. You may run into issues booting Windows 10 without UEFI while Grub has no problems either way. As a result you may need to turn UEFI back on, but you will need to leave Secure Boot disabled in order to boot Ubuntu.

It appears that you want this computer to default to booting to Windows, which is your choice we suppose, in which case you may need to change the settings for GRUB_ DEFAULT in /etc/default/grub. This specifies which of the menu options for Grub to use as default and can be either be the number of the entry – counted from zero – or the title as shown in the boot menu. So if Windows 10 is the third option in the menu, you could use either of GRUB_DEFAULT=2 GRUB_DEFAULT=’Windows 10’ After making any changes to /etc/default/ grub, you need to run update-grub again to apply them to the menu.