Recently I have installed ubuntu onto a win 10 machine so that it dual boots. I am finished with ubuntu and want to remove it from win 10 safely. However I do not want to reinstall windows like some tutorials do and I don't have any disks to do so. Is there anyway to remove Ubuntu and GRUB without Windows 10 disks?

p.S i am running 18.04


Here there is the usefull guide for you. I used a similar procedure to do the same thing you asked for.

How to Remove Linux (Ubuntu) From Dual Boot in Windows 10

NOTE: you can extend your Windows partition for recover space only if two partition are consecutive.

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