2021-05-18 14:21:48 +02:00
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---
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2021-07-15 19:58:32 +02:00
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title: GNU+Linux guides
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2021-05-18 14:21:48 +02:00
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x-toc-enable: true
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...
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This page is useful for those who wish to use the GRUB GRUB payload directly.
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If you're using SeaBIOS, the boot process will work similarly to traditional
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BIOS systems; refer to the SeaBIOS documentation
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on <https://seabios.org/SeaBIOS>
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GNU+Linux is the operating system of choice, for Libreboot development. It is
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highly recommended over any other operating system, precisely because it consists
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of [Free Software](https://www.gnu.org/philosophy/free-sw.html) (free as in
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freedom). There *are* other free operating systems, such as BSD, but most of
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the software in a typical GNU+Linux system is also *copylefted*. To learn more
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about the importance of copyleft, read this page on the GNU website:
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<https://www.gnu.org/licenses/copyleft.html>
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Useful links
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============
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Refer to the following pages:
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* [How to Prepare and Boot a USB Installer in Libreboot Systems](grub_boot_installer.md)
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* [Modifying the GRUB Configuration in Libreboot Systems](grub_cbfs.md)
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* [Installing Hyperbola GNU+Linux, with Full-Disk Encryption (including /boot)](https://wiki.hyperbola.info/en:guide:encrypted_installation)
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* [Installing Debian or Devuan GNU+Linux-Libre, with Full-Disk Encryption (including /boot)](encrypted_debian.md)
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2021-10-29 04:47:12 +02:00
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* [Installing Guix System, with Full-Disk Encryption (including /boot)](guix.md)
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2021-05-18 14:21:48 +02:00
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* [How to Harden Your GRUB Configuration, for Security](grub_hardening.md)
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2021-07-10 21:38:41 +02:00
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Guix, Parabola, Trisquel
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2021-07-24 23:27:52 +02:00
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========================
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2021-07-10 21:38:41 +02:00
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These guides were outdated, so they were deleted. You can find links to them
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here: <https://notabug.org/libreboot/lbwww/issues/4>
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The above issue page is the same as this entry on the TODO page:
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[../../tasks/#move-all-distro-fdeboot-guides-to-distro-wikimanuals](../../tasks/#move-all-distro-fdeboot-guides-to-distro-wikimanuals)
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The Debian guide has been retained, because it's currently up to date. The
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Hyperbola guide is already on the Hyperbola website, and the above is just a
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link.
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In general, it is recommended that you use SeaBIOS but if you want extra security,
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GRUB payload is recommended where you can then have a fully encrypted /boot
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directory.
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TODO: Nuke *all* distro-specific guides on libreboot.org. Instead, move these
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instructions to the wiki pages of these projects, on their websites. The reasons
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are explained in the above issue page.
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2021-07-15 19:58:32 +02:00
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Rebooting system in case of freeze
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===================================
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Linux kernel has a feature to do actions to the system any time, even
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with it freezes, this is called a
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[Magic SysRq keys](https://en.wikipedia.org/wiki/Reisub). You can do these
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actions with Alt + Sysrq + Command. These are the actions:
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* Alt + SysRq + B: Reboot the system
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* Alt + SysRq + I: Send SIGKILL to every process except PID 1
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* Alt + SysRq + O: Shut off the system
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If some of them don't work, you have to enable it in the kernel
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command line paramter. So append `sysrq_always_enabled=1` to your
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`GRUB_CMDLINE_LINUX_DEFAULT` in `/etc/default/grub`
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You can also run `# sysctl kernel.sysrq=1` to enable them.
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2021-07-24 23:27:52 +02:00
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Fedora won't boot?
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==================
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This may also apply to CentOS or Redhat. Chroot guide can be found on
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[fedora website](https://docs.fedoraproject.org/en-US/quick-docs/bootloading-with-grub2/#restoring-bootloader-using-live-disk)
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linux16 issue
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-------------
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When you use Libreboot's default GRUB config, and libreboot's grub uses fedora's
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default `grub.cfg` (in `/boot/grub2/grub.cfg`), fedora by default makes use of the
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`linux16` command, whereas it should be saying `linux`
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Do this in fedora:
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Open `/etc/grub.d/10_linux`
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Set the `sixteenbit` variable to an empty string, then run:
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grub2-mkconfig -o /boot/grub2/grub.cfg
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BLS issue
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---------
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With [newer versions of fedora](https://fedoraproject.org/wiki/Changes/BootLoaderSpecByDefault),
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scripts from grub package default to generating [BLS](https://www.freedesktop.org/wiki/Specifications/BootLoaderSpec/)
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instead of `grub.cfg`. To change that behaviour add following line
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to `/etc/default/grub` (or modify existing one if it already exists):
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GRUB_ENABLE_BLSCFG=false
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Then generate `grub.cfg` with:
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grub2-mkconfig -o /boot/grub2/grub.cfg
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