My Toshiba laptop came with Windows 7 pre-installed. I installed Xubuntu on dual-boot (BIOS not UEFI). When Windows 10 came out, I upgraded to it, but now Grub shows two entries for Windows (besides the Windows Recovery Environment):
Windows 10 (on /dev/sda1) Windows 7 (on /dev/sda2)
Windows 10 is installed on /dev/sda2 and there's no Windows 7 anymore.
I'm suspecting that the Windows bootloader is on sda1, but why is there a Windows 7 (which doesn't boot) and how do I remove the entry from Grub?
If I try to boot the Windows 7 entry I get a Windows Boot Manager screen saying:
A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source.
If you have a windows installation disc, insert the disc and restart your computer. Click "Repair your computer," and then choose a recovery tool,
Otherwise, to start windows so you can investigate further, press the ENTER key to display the boot menu, press FS for Advanced Boot Options, and select Last Known Good. If you understand why the digital signature cannot be verified and want to start windows without this file, temporarily disable driver signature enforcement.
File: \Windows\system32\winload.exe
Status: 0xc0000428
Info: Windows cannot verify the digital signature for this file.
I could modify the grub.cfg file manually or through Grub customizer to get rid of the redundant Win 7 entry, but this would be recreated the first time update-grub is run. How do I get rid of the grub entry permanently?
BOOTMGRin sda2 and try getting rid of it?update-grubstill generates the useless entry first.