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After deleting the partitions of ubuntu on my windows 10, I started to get this grub screen. I wanted to perform most of the solutions offered here but I don't have a windows installation disk because my windows 8 is built-in and i did an online windows 10 upgrade. please advise

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You should login to Windows in the recovery mode(if needed using the installation disk - hopefully even Windows 8 should allow you to do so). Otherwise try to create a recovery media of Windows 10 after login into that.

Then at the command promot(Run as administrator)

bootrec /fixMbr
bootrec /fixboot

For more details please refer to this

Ashu
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