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In partition table, we can give /boot as mount point. But we can, too, toggle bootable flag. What's difference between those two?

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As for boot flag, see here. It is usually not needed for Ubuntu installation.

Boot mount point is the partition you mount your /boot to, if you use a separate /boot partition. If you do not have a separate /boot partition, /boot is just a directory under /. See here for more about partitions and mount points used in Ubuntu installation.

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The /boot mount point specifies the location to install the bootloader (GRUB, Syslinux), to be used by legacy BIOS-based systems in order to boot when the actual boot device contains a GUID Partition Table (GPT).

A boot flag, on the other hand, is a 1-byte value in a non-extended partition record, within a master boot record. Its primary function is to indicate to a MS-DOS/MS Windows-type boot loader which partition to boot.


If you have an MBR (Master Boot Record) type partition table, all you need to do is to set a boot flag on the root filesystem /. However, if you have a GPT partition table, you need to create a separate BIOS boot partition and install GRUB to it.

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  • So, is it okay to create one partition with /boot as mount point and bootable flag is activated? – Mas Bagol Jan 9 '15 at 17:30
  • Usually better for most desktops not to even have a /boot partition. Server type installs or LVM encrypted installs may need a /boot partition. Grub boot loader does not use boot flag, but a few BIOS want to see a boot flag on a primary partition which is only a Windows requirement, but also used by syslinux on live installer. so we still suggest a boot flag on a primary partition, just in case you have one of those few BIOS (mostly Intel motherboards). – oldfred Jan 9 '15 at 17:39
  • I have added the information to the answer. – Rohith Madhavan Jan 9 '15 at 17:40
  • BIOS boot partition is not mounted as /boot; see here. – jarno Jan 23 '16 at 18:38

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