I've installed ubuntu18.04 alongside win10. After booting windows in Ubuntu grub2 menu, however, the windows crashed into black screen with info "BOOTMGR image is corrupt, cannot boot".

How to fix the broken win boot in Ubuntu? The boot mode in my laptop is Legacy+MBR.

  • This is a problem on the Windows side, I believe. BOOTMGR is the Windows boot loader, which gets chain-loaded by GRUB if you pick Windows in the menu. You will probably need Windows boot repair tools to restore this BOOTMGR. After that, you'll probably also have to reinstall GRUB again as whatever repair tool you use will likely overwrite and remove GRUB too. I suggest you ask your question on Super User instead though, as Windows is off-topic here. – Byte Commander Mar 6 at 0:43

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