I have recently installed Ubuntu 20.04. The dual boot was working fine. Today when the laptop is started, there was some massage which I don't remember exactly, but it was similar to "Hard disk not found". Now the laptop is not showing the dual boot option.
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Does this answer your question? Can't boot into Ubuntu in Windows 10 / Ubuntu dual boot – karel May 05 '21 at 16:22
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1Windows updates or fwupdate from Ubuntu may have updated UEFI, resetting it to defaults. Double check UEFI settings. – oldfred May 05 '21 at 16:31
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Thank you. The problem is solved, by resetting UEFI and adding the ubuntu option manualy. – VRD May 16 '21 at 16:30