Table of Contents
- 1. Run LiveDVD
- 2. Mount storage
- 3. Copy /etc/default/grub
- 4. Run chroot
- 5. Run lvm2-lvmetadの起動
- 6. Repair GRUB2
1 Run LiveDVD
Run Ubuntu 16.04’s LiveDVD like ubuntu-16.04.1-desktop-amd64.iso and select “Try Ubuntu”.
2 Mount storage
Mount HDD and SSD which is installed Ubuntu 16.04. This article uses VirtIO and storage device is /dev/vda. In case of physical machine is /dev/sda.
When using LVM, /dev/vda1 is /boot, /dev/vda5 is LVM volume and /dev/ubuntu-vg is root filesystem. When not using LVM, /dev/vda1 is /boot and /dev/vda5 is root filesystem.
$ sudo mount -o rw /dev/ubuntu-vg/root /mnt # In case non-lvm is /dev/vda5$ sudo mount -o rw /dev/vda1 /mnt/boot$ for fs in proc sys dev; do sudo mount -o bind /$fs /mnt/$fs; done
3 Copy /etc/default/grub
grub-mkconfig’s variable is defined at /etc/default/grub. When installing Ubuntu, /etc/default/grub in LiveDVD will be copied to root filesytem.
$ sudo cp /etc/default/grub /mnt/etc/default/
4 Run chroot
Run chroot to storage root filesystem.
$ sudo chroot /mnt
5 Run lvm2-lvmetadの起動
When using LVM, grub-mkconfig needs running /etc/init.d/lvm2-lvmetad.
# /etc/init.d/lvm2-lvmetad start
6 Repair GRUB2
Reinstall GRUB2 package.
# sudo apt install -y grub2 –reinstall
Write GRUB2 to MBR and /boot with grub-install.
# grub-install /dev/vdaInstalling for i386-pc platform.Installation finished. No error reported.
Create GRUB2 menu with grub-mkconfig.
# grub-mkconfig -o /boot/grub/grub.cfgGenerating grub configuration file …Found linux image: /boot/vmlinuz-4.4.0-42-genericFound initrd image: /boot/initrd.img-4.4.0-42-genericFound linux image: /boot/vmlinuz-4.4.0-38-genericFound initrd image: /boot/initrd.img-4.4.0-38-genericFound linux image: /boot/vmlinuz-4.4.0-31-genericFound initrd image: /boot/initrd.img-4.4.0-31-genericFound memtest86+ image: /memtest86+.elfFound memtest86+ image: /memtest86+.bindone
