Marking a partition bootable (MS-DOS style)?

I recently installed ubuntu 17.10 on a computer, and noticed that fdisk is not showing me the boot flag as it used to do.

Yes you can, but some systems need a boot flag enabled otherwise you can get boot errors. You can toggle a boot flag within fdisk using the a key.

In this tutorial, you will find the step by step instructions to set or change the boot partition flag on a Linux system via command line and GUI.

Unlike Linux fdisk, there's no a option to toggle the bootable flag. Anyone know how to edit the default MBR record so fdisk -iy creates one partition with ...

You can set the bootable flag on GPT by going to the advanced menu with x and using the A command to toggle the flag. Share.

With fdisk I created the System EFI partition and it automatically had the bootable flag with GPT which I could see with parted1 , even though I ...

圖1. fdisk 公用程式的不同選項範例 # fdisk /dev/sdb Command (m for help): m Command action a toggle a bootable flag b edit bsd disklabel c toggle the dos ...

In fdisk you use the a command to toggle a partition's active (bootable) flag. In parted you use the toggle or set commands to change ...

UEFI (which I presume you are using according to the screenshot) does not need the bootable flag on a partition, only BIOS boot does. ... Can't ...