Confusion about dual-booting Ubuntu and Windows 8. CSM or UEFI?
As far as I have heard, dual booting (Ubuntu and Windows) in UEFI isn't very clean, and hence people prefer CSM when doing so. But, in case my laptop has Windows pre-installed in UEFI, I need to reinstall it to get it in CSM.
Now, my laptop's boot menu has an option of UEFI and CSM. What could this option mean? Does it mean I can dual boot without any hassles?
Each firmware can be different, but generally this option means that your firmware will first try to boot in UEFI mode (it will search for .efi files corresponding to your UEFI entries), then if it fails to boot in UEFI mode it will try to boot in Legacy mode.
dual boot windows 8.1 and Ubuntu 14-10
- Install Windows 8.1
- Install Ubuntu
- Restart
- Your computer will no show you the option to select the operating system that you want to boot. Don't worry, boot into Ubuntu
- Open a terminal
- Run de following command update-grub
Enjoy your dual boot!