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Installer of 14.04.1 LTS doesn't recognize Windows 7

rated 0 times [ 1] [ 0] / answers: 1 / hits: 9991 / 2 Years ago, fri, october 28, 2022, 2:23:39

I have Windows 7 on my PC but I'm kinda sick of it so I wanted to install Ubuntu. But I have many programs and stuff in W7 that I need so I want to dual boot. But when I'm booting the Ubuntu from my USB drive and trying to start the installation, it just says no operating systems recognized on my PC. I have tried all kind of partitioning in the Windows disk management system. But none of them seems to work. I would be very grateful if someone could help me with this!

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answered 2 Years ago ionodest · Accepted Answer

Alright, now that I understand your situation a little better...

Your Windows is booting in Legacy/BIOS mode.

Since the Ubuntu installer is booting in EFI mode (due to UEFI having higher priority than BIOS in the EFI setup), it does not see Windows due to the incompatibilities between the two modes. This actually has to do with differences in disk partitioning between the two modes -- MBR vs GPT partitioning. Ubuntu is booted in EFI mode and so it looks for a GPT table and GPT partitions which don't exist due to Windows using the MBR partitioning scheme.

To be able to see Windows, change the boot priority to Legacy/BIOS first, then UEFI to get Ubuntu to boot in BIOS (purple screen) mode.

Or, use the kernel option 'noefi' when booting the installer (note: I haven't actually tested this)