1

This is my computer and I have added a new blank SATA SSD (Disc 0) for installing Ubuntu 20.04 in order to dual boot with Windows 11 Pro pre-installed on SSD (Disc 1) from the factory.

This is before installing Ubuntu.

enter image description here

This is after installing Ubuntu.

enter image description here

Unfortunately, I forgot to change Secure Boot to Disabled before installing Ubuntu by Install Ubuntu alongside Windows Boot Manager. So, the computer still boot Windows without showing grub. I then changed the Secure Boot to Disabled, the computer still boot Windows without showing grub. I have no dare to switch from UEFI to Legacy, is this the correct way ?

Nukool
  • 127
  • No, switching to Legacy is NEVER the solution. Opening UEFI settings > Boot and assuring Ubuntu (Grub) has the first boot priority is what you should do before anything else. Secure Boot has nothing to do with it and AFAIK with Windows 11 it's a requirement. There's a potential problem because now you have two EFI partitions which suggests the installation was incorrect for a dual-boot. For a dual-boot what you need to disable is Windows' Fast Startup. – ChanganAuto Apr 06 '22 at 14:35
  • Go into UEFI setup and set it to boot Ubuntu (grub) first. Grub will show you the choice to boot Windows or Ubuntu. – user68186 Apr 06 '22 at 14:55
  • You can have one ESP per drive without issue. Just cannot have two per drive. UEFI should let you boot ubuntu entry. If you use the UEFI boot menu (same key as you used to select USB flash drive) does it show an ubuntu entry? Some systems like HP require you to change boot order in UEFI settings, some like Acer require you to set "trust" in UEFI menu on the Ubuntu entry to authorize it as bootable, so you may need to reveiw UEFI settings. https://askubuntu.com/questions/708247/cant-boot-into-ubuntu-in-windows-10-ubuntu-dual-boot – oldfred Apr 06 '22 at 16:39
  • link After I switched Boot option #1 to Ubuntu (PO: Apacer ...], the computer booted Ubuntu immediately without grub menu. And after I powered off Ubuntu and switched on , my computer did not boot any OS anymore. – Nukool Apr 07 '22 at 00:05
  • When you enter the UEFI you still see both disks, right? Boot with your usb-stick (the one you used to install Ubuntu and choose 'try Ubuntu'), go to the terminal and type sudo update-grub. As long as you use Grub 2.04 OS_prober (this will change with Grub 2.06 which comes with Ubuntu 22.04) is enabled and grub should see both Ubuntu and Windows. – HomerSimpson Apr 08 '22 at 16:25

0 Answers0