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<primary>ESP</primary><seealso>EFI System Partition</seealso>
<primary>EFI System Partition</primary>
<primary><emphasis role="pkg">grub-pc</emphasis></primary>
<primary><emphasis role="pkg">grub-efi-<replaceable>arch</replaceable></emphasis></primary>
<primary><emphasis role="pkg">grub-efi-<replaceable>arch</replaceable>-signed</emphasis></primary>
Using <emphasis>GRUB</emphasis> to boot either a traditional BIOS system (legacy or UEFI-CSM) or a UEFI system is quite different. Fortunately the user doesn't need to know the differences because Debian provides different packages for each purpose and the installer automatically cares about which one(s) to choose. The <emphasis role="pkg">grub-pc</emphasis> package is chosen for legacy systems, where <emphasis>GRUB</emphasis> is installed into the MBR, while UEFI systems require <emphasis role="pkg">grub-efi-<replaceable>arch</replaceable></emphasis>, where <emphasis>GRUB</emphasis> is installed into the EFI System Partition (ESP). The latter requires a GTP partition table as well as an EFI partition. <ulink type="block" url="https://wiki.debian.org/Grub2#UEFI_vs_BIOS_boot" />
To switch an existing system (supporting UEFI) from legacy to UEFI boot mode not only requires to switch the <emphasis>GRUB</emphasis> packages on the system, but also to adjust the partition table and the to create an EFI partition (probably including resizing existing partitions to create the necessary free space). It is therefore quite an elaborate process and we cannot cover it here. Fortunately, there are some manuals by bloggers describing the necessary procedures.
If you are using a system with “Secure Boot“ enabled and have installed <emphasis role="pkg">shim-signed</emphasis> (see sidebar <xref linkend="sidebar.secure-boot" />), you must also install <emphasis role="pkg">grub-efi-<replaceable>arch</replaceable>-signed</emphasis>. This package is not pulled in automatically, only if the installation of recommended package has been enabled.
Other Configurations: Time Synchronization, Logs, Sharing Access…
The many elements listed in this section are good to know for anyone who wants to master all aspects of configuration of the GNU/Linux system. They are, however, treated briefly and frequently refer to the documentation.
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User avatar kingu

Comment added

  1. Debian Handbook
  2. 08_basic-configuration
  3. English

Presumably this should be "The latter requires a GPT partition"? (rather than GTP)

a year ago
User avatar None

Source string added

  1. Debian Handbook
  2. 08_basic-configuration
  3. English
Using <emphasis>GRUB</emphasis> to boot either a traditional BIOS system (legacy or UEFI-CSM) or a UEFI system is quite different. Fortunately the user doesn't need to know the differences because Debian provides different packages for each purpose and the installer automatically cares about which one(s) to choose. The <emphasis role="pkg">grub-pc</emphasis> package is chosen for legacy systems, where <emphasis>GRUB</emphasis> is installed into the MBR, while UEFI systems require <emphasis role="pkg">grub-efi-<replaceable>arch</replaceable></emphasis>, where <emphasis>GRUB</emphasis> is installed into the EFI System Partition (ESP). The latter requires a GTP partition table as well as an EFI partition. <ulink type="block" url="https://wiki.debian.org/Grub2#UEFI_vs_BIOS_boot" />
a year ago
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User avatar kingu

Source string comment

Presumably this should be "The latter requires a GPT partition"? (rather than GTP)

a year ago

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read-only, xml-text
String age
a year ago
Last updated
11 months ago
Source string age
a year ago
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string 687