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Tags: dual-boot   grub2   uefi  
Link: πŸ” See Original Answer on Ask Ubuntu πŸ”—

URL: https://askubuntu.com/q/1156055
Title: Failing to boot to grub with dual boot Dell laptop
ID: /2019/07/05/Failing-to-boot-to-grub-with-dual-boot-Dell-laptop
Created: July 5, 2019
Upload: November 24, 2022    Layout:  post
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You don’t have to switch to legacy mode to boot the Ubuntu Live USB. It’s a hybrid .ISO that works in both CSM (legacy) and UEFI mode.

It’s not really an β€œEFI” partition but rather partitions are β€œMBR” (Master Boot Record) or β€œGPT” (GUID Partition Table). Generally speaking UEFI systems use GPT partitioned disks and CSM (legacy) systems use β€œMBR” partitioned disks.

The old days of β€œMBR” only allowed 4 primary partitions which could be divided into extended logical partitions. The new days of β€œGPT” allow many more partitions.

The important things to remember is most people suggest AHCI instead of Intel RAID is better to install Ubuntu. Also most people suggest Secure boot should be turned off.

Finally after installing you may still need to run boot-repair:

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