![]() Thus, you'll end up doing more manually, which means there's more room to miss a step or make a mistake.įor more information on Linux and Secure Boot, read my main Web page on the subject, which covers basic principles and typical configurations. When you do a conversion from an existing BIOS-mode installation, you're more likely to run into problems, since conversion tools don't really exist (unless you count Boot Repair, which does only part of the job). Also, using Secure Boot makes it easier to misconfigure something so that it breaks.) When doing a fresh install with Secure Boot active, it should all be pretty transparent. (There are occasional exceptions because of finicky EFIs, though. Secure Boot requires Shim, PreLoader, or special custom setups and depending on the boot loader, a signed kernel may be required.Īs you might gather from this, Ubuntu should work fine with Secure Boot. As I've written above, partitioning will need to be adjusted, but that doesn't require any software changes. These are indeed helpful, but not critical for booting.) There are no changes to the kernel, C libraries, shells, GUI, or other core tools required under EFI compared to BIOS. (In practice, installing an EFI-mode GRUB is likely to pull in some other related packages, like efibootmgr. Thus, switching from BIOS-mode to EFI-mode booting doesn't require additional software changes. Note that in a Linux installation, the only truly critical software difference between a BIOS-mode and an EFI-mode installation is the boot loader. If you have problems, your best bet is to search here and elsewhere for a solution, and if you don't find one, post a new question here or on some other forum. Any number of things can go wrong with all this. ![]() Most other boot loaders will require jumping through some extra hoops to work with Secure Boot, although sometimes this isn't too bad - if it detects Shim (the most common Linux tool for supporting Secure Boot), my own rEFInd will set itself up to use Secure Boot. ![]() Boot Repair should also set things up to work with Secure Boot. GRUB 2 is the traditional boot loader, and it can be installed fairly automatically by booting an Ubuntu live CD in EFI mode and running Boot Repair. Although an ESP is usually the first or second partition on a disk, the realities of partition resizing mean that it may work better to make it the last partition on the disk if you're converting from BIOS/MBR to EFI/GPT. You'll probably have to use GParted to resize at least one partition to make room for the ESP. This is a partition where EFI boot loaders reside. This can be done fairly painlessly with my gdisk program (which is installed in Ubuntu by default), as described here. Thus, an MBR-to-GPT conversion is desirable. This step may not be strictly required, but some EFIs can be fussy, and using MBR may require installing your boot loader to the fallback filename ( EFI/BOOT/boot圆4.efi), which most tools won't do by default.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |