After rebooting my crashed ubuntu following error popped up:
No bootable device -- Insert boot disk and press any key
The grub of my encrypted xubuntu needs to be reinstalled. Therefore i started on the same maschine with a ubuntu sick. It’s important to start in the same way your os is booting up. In my case it’s a 64 bit starting in efi mode not BIOS mode.
After booting up with the thumbdrive you check if it’s the right boot mode:
[ -d /sys/firmware/efi ] && echo UEFI || echo BIOS UEFI
Thats the right mode for my, next we switch to root:
sudo su
Something like this will show up:
root@ubuntu:/home/ubuntu#
Show the partitions of our disk (sda):
fdisk -l Disk /dev/sda: 100 GiB, 1000000000 bytes, 100000000 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: gpt Disk identifier: 123123123-123123-123123-123123-123123 Device Start End Sectors Size Type /dev/sda1 1223 1231231 1231231 111M EFI System /dev/sda2 1231231 1231231 123123 111M Linux filesystem /dev/sda3 1231231 123123123 123123123 1111G Linux filesystem
In order to use the encrypted filesystem we have to load a kernel module called dm-crypt:
modprobe dm-crypt
We need to open the LUKS partition, which can be done with cryptsetup:
cryptsetup luksOpen /dev/sda3 linux Enter passphrase for /dev/sda3:
Scan if volume group is there:
vgscan Reading all physical volumes. This may take a while... Found volume group "xubuntu-vg" using metadata type lvm2
Activate volume group:
vgchange -ay xubuntu-vg 2 logical volume(s) in volume group "xubuntu-vg" now active
lvscan ACTIVE '/dev/xubuntu-vg/root' [123 GiB] inherit ACTIVE '/dev/xubuntu-vg/swap_1' [12 GiB] inherit
Prepare chroot environment:
mkdir /mnt/linux
mount /dev/xubuntu-vg/root /mnt/linux
mount -o bind /proc /mnt/linux/proc
mount -o bind /dev /mnt/linux/dev
mount -o bind /sys /mnt/linux/sys
chroot /mnt/linux /bin/bash
Something like this should follow:
root@ubuntu:/#
We are now in your chrooted into the filesystem that needs care.
Mount /boot from /dev/sda2 and /efi from /dev/sda1:
mount /dev/sda2 /boot mount /dev/sda1 /boot/efi
Grub install:
grub-install /dev/sda Installing for x86_64-efi platform. Installation finished. No error reported.
Update grub:
update-grub Generating grub configuration file ... Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported. Found linux image: /boot/vmlinuz-3.13.0-66-generic Found initrd image: /boot/initrd.img-3.13.0-66-generic Found linux image: /boot/vmlinuz-3.13.0-65-generic Found initrd image: /boot/initrd.img-3.13.0-65-generic Found linux image: /boot/vmlinuz-3.13.0-63-generic Found initrd image: /boot/initrd.img-3.13.0-63-generic Found linux image: /boot/vmlinuz-3.13.0-53-generic Found initrd image: /boot/initrd.img-3.13.0-53-generic grub-probe: error: cannot find a GRUB drive for /dev/sdb1. Check your device.map. Adding boot menu entry for EFI firmware configuration done root@ubuntu-mate:/#
Just reboot with your repaired system!