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Server does not boot

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Server does not boot

Grub is not found? Or you get error messages during the boot process such as Kernel Panic – not syncing. We show you here how to fix Grub and initramfs

  1. Start the Ubuntu-Desktop CD
  2. Execute the following commands to mount the hard disk
  3. Variante A)
    mount /dev/mapper/sr00--vg-root /mnt
    mount /dev/sda2 /mnt/boot
    mount --bind /dev /mnt/dev
    mount --bind /dev/pts /mnt/dev/pts
    mount --bind /proc /mnt/proc
    mount --bind /sys /mnt/sys
    mount --bind /run /mnt/run
    chroot /mnt
    apt-get install --reinstall linux-image-5.4.0-73-generic
    

     

    Variante B)

    mount /dev/mapper/ubuntu--vg-root /mnt for i in /dev /dev/pts /proc /sys /run; do sudo mount -B $i /mnt$i; done
    mount /dev/sda2 /mnt/boot
    chroot /mnt
    grub-install /dev/sda
    /dev/sda --force update-initramfs -u -k all



    Variante C)

    mount /dev/sdXY1 /mnt
    mount /dev/sda2 /mnt/boot
    for i in /dev /dev/pts /proc /sys /run; do sudo mount -B $i /mnt$i; done
    chroot /mnt
    grub-install /dev/sda
    update-initramfs -u
    update-grub  /dev/sdXY1
    apt-get install --reinstall linux-image-5.4.0-73-generic grub-update (sicherstellen, dass Grub und die Kernel angezeigt werden)
  4. Now restart the server.

 

This should be enough to fix grub and initramfs. Also make sure that the kernel data is in the /boot folder.

 

At boot time appears:

ALERT! /dev/mapper/ubuntu–vg-root does not exist. Dropping to a shell!

Here the server is missing the LVM functions.
Mount the server as in step 2 and then install the following:

 

 

apt-get install libarchive-zip-perl lvm2 cryptsetup 
update-initramfs -u -k all

Alternative:

mount /dev/mapper/sr00--vg-root /mnt
mount --bind /dev /mnt/dev
mount --bind /dev/pts /mnt/dev/pts
mount --bind /proc /mnt/proc
mount --bind /sys /mnt/sys
mount --bind /run /mnt/run

 

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