Windows installed in uefi mode and Ubuntu in legacy mode

Asked by Karandeep Padam on 2019-01-07

I recently installed Ubuntu on my Lenovo G50 alongside pre-existing windows 10. Both are installed in different modes which makes me go to BIOS setup everytime I wanna boot a different OS. Is there a way I can install Ubuntu on uefi mode?

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Jeremy (wa113y3s) said : #1

Set BIOS to UEFI only and boot the ISO and install Ubuntu, or use the ISO to install grub-efi-amd64-signed and put the grub in the EFI system partition

Karandeep Padam (lostctrl) said : #2

I would likely do a new install but when it's in UEFI mode it doesn't boots from my bootable USB. Can u help?

Manfred Hampl (m-hampl) said : #3

See for instructions how to convert the Ubuntu legacy installation into UEFI mode with help off boot-repair.

Karandeep Padam (lostctrl) said : #4

I did as it was mentioned in the instructions but it didn't work. There are some things I noticed I would like to mention. In boot-repair, in GRUB location the "Separate /boot/efi partition" line (sda1) was already ticked. On applying it said I am in legacy mode and i need to go to uefi for changes to take effect which is correct but when I changed the boot method in BIOS and saved changes, it booted me in windows 10 without giving options for ubuntu. Should i disable fast boot? Did i miss something? Please help.

Manfred Hampl (m-hampl) said : #5

"Should i disable fast boot?"

It's all written in

Jeremy (wa113y3s) said : #6

Write a new Ubuntu 18.04 ISO to the USB drive using the Startup Disc Creator tool in Ubuntu and see if it will boot in EFI mode

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