150 lines
4.4 KiB
Markdown
150 lines
4.4 KiB
Markdown
## Fixing Debian/Ubuntu UEFI boot manager with Debian/Ubuntu Live
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source : [Code Bites](https://emmanuel-galindo.github.io/en/2017/04/05/fixing-debian-boot-uefi-grub/)
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Steps summary:
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- Boot Debian Live
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- Verify Debian Live was loaded with UEFI
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- Review devices location and current configuration
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- Mount broken system (via chroot)
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- Reinstall grub-efi
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- Verify configuration
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- Logout from chroot and reboot
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### Verify Debian Live was loaded with UEFI :
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~~~
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from live $ dmesg | grep -i efi
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~~~
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~~~
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from live $ ls -l /sys/firmware/efi | grep vars
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~~~
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### Mount broken system (via chroot)
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Mounting another system via chroot is the usual procedure to recover broken system’s. Once the chroot comand is issues, Debian Live will treat the broken system’s “/” (root) as its own. Commands run in a chroot environment will affect the broken systems filesystems and not those of the Debian Live.
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#### My system is full ZFS
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You have to add *-f* to force import because zfs think he should be on an other system.
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*-R* is to use an altroot path.
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~~~
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from live $ sudo su
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from live # zpool import -f -R /mnt rpool
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~~~
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~~~
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from live # zpool import bpool
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~~~
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Here system will tell you he can't mount it because /boot is in use. We don't wanted to mount it here, we will do it inside the chroot.
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~~~
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from live # zfs mount rpool/ROOT/ubuntu_myid
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~~~
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I'm in the case where ny zpool is encrypt !
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see : [zfs trouble encrypt zpool](zfs-trouble-live-boot-solution)
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#### My system is not ZFS
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Mount root partition (for example an lvm)
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~~~
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from live # mount /dev/volumegroup/logicalvolume /mnt
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~~~
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Mount boot partition (F.e. in drive sda)
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~~~
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from live # mount /dev/sda2 /mnt/boot
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~~~
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Mount the EFI System Partition (usually in /dev/sda1)
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~~~
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from live # mount /dev/sda1 /mnt/boot/efi
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~~~
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### Prepare chroot env
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Mount the critical virtual filesystems with the following single command:
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~~~
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from live # for i in /dev /dev/pts /proc /sys /run; do sudo mount -B $i /mnt$i; done
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~~~
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Mount all zfs file system on rpool.
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~~~
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from live # zfs mount -a
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~~~
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Chroot to your normal (and broken) system device
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~~~
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from live # chroot /mnt
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~~~
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Then here mon bpool zfs vol.
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~~~
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inside chroot # zfs mount -a
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~~~
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Mount your EFI partition:
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~~~
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inside chroot # mount -a
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~~~
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You should see :
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* all your rpool zfs vol
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* /boot from your bpool.
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* Your efi partition.
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~~~
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inside chroot # df -h
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Sys. de fichiers Taille Utilisé Dispo Uti% Monté sur
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udev 16G 0 16G 0% /dev
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tmpfs 3,2G 1,8M 3,2G 1% /run
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rpool/ROOT/ubuntu_19k4ww 272G 3,7G 269G 2% /
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bpool/BOOT/ubuntu_19k4ww 1,2G 270M 929M 23% /boot
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rpool/USERDATA/yourlogin_43xnpb 280G 12G 269G 5% /home/yourlogin
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rpool/USERDATA/root_43xnpb 269G 640K 269G 1% /root
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rpool/ROOT/ubuntu_19k4ww/srv 269G 128K 269G 1% /srv
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rpool/ROOT/ubuntu_19k4ww/var/lib 269G 34M 269G 1% /var/lib
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rpool/ROOT/ubuntu_19k4ww/var/log 269G 47M 269G 1% /var/log
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rpool/ROOT/ubuntu_19k4ww/var/spool 269G 128K 269G 1% /var/spool
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/dev/nvme0n1p1 511M 16M 496M 4% /boot/efi
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rpool/ROOT/ubuntu_19k4ww/var/games 269G 128K 269G 1% /var/games
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rpool/ROOT/ubuntu_19k4ww/var/snap 269G 128K 269G 1% /var/snap
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rpool/ROOT/ubuntu_19k4ww/var/mail 269G 128K 269G 1% /var/mail
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rpool/ROOT/ubuntu_19k4ww/usr/local 269G 256K 269G 1% /usr/local
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rpool/ROOT/ubuntu_19k4ww/var/www 269G 128K 269G 1% /var/www
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rpool/ROOT/ubuntu_19k4ww/var/lib/AccountsService 269G 128K 269G 1% /var/lib/AccountsService
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rpool/ROOT/ubuntu_19k4ww/var/lib/NetworkManager 269G 256K 269G 1% /var/lib/NetworkManager
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rpool/ROOT/ubuntu_19k4ww/var/lib/apt 269G 77M 269G 1% /var/lib/apt
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rpool/ROOT/ubuntu_19k4ww/var/lib/dpkg 269G 41M 269G 1% /var/lib/dpkg
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/dev/nvme0n1p1 511M 16M 496M 4% /boot/efi
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~~~
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### Reinstall grub-efi
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~~~
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inside chroot # apt-get install --reinstall grub-efi
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~~~
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~~~
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inside chroot # grub-install /dev/sda
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~~~
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~~~
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inside chroot # update-grub
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~~~
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