Windows boot error after installing Pop OS 20

[oldfred]

With UEFI, you can directly boot Windows from UEFI boot menu.
Grub only boots working Windows and you need to then diretly boot Windows.

With BIOS, you then have to use your Windows repair flash drive to temporaily install the Windows boot loader to MBR, boot Windows, fix Windows, and then restore grub, so you can dual boot.
Note that Windows will keep turning fast start up on. Or Windows 10 is not particularly easy to dual boot in the now 35 year old BIOS/MBR configuration. Just be sure to always have your Windows repair disk and Ubuntu live installer and know how to add Boot-Repair or do manual grub reinstall.

Boot-Repair may offer to install Windows type boot loader to MBR, syslinux or you may be able to force install. But if Windows fast start up on, it just may not see the NTFS partition to know you need a Windows type boot loader.

Windows 10 repair disk
https://askubuntu.com/questions/1156...925839_1156795
https://www.tenforums.com/software-a...scue-disk.html
http://www.tenforums.com/tutorials/4...dows-10-a.html
http://www.tenforums.com/tutorials/3...dows-10-a.html
Repair/backup/restore
https://support.microsoft.com/en-us/...recovery-drive &
http://windows.microsoft.com/en-us/w...covery-options

[alvarezjones]

• #4

I have solved the issue.

I used boot-repair.
went to advanced options
went to reinstall MBR and repair windows files
chose the windows recovery sda as the default boot, restarted then
chose the windows 7 partition as the default boot. restarted then
chose the windows 10 partition as the default boot.
restarted it.
And signed into my windows 10.

Then deleted the popOS partition for future reinstallation.