Linux Kubuntu How to Recover an Upgraded Non Bootable EFI System
You are Welcome! The Tutorial shows you Step-by-Step How to Try a Generic Recovery for a Non Bootable EFI Kubuntu 14.04-Trusty/14.10-Utopic/15.04-Vivid GNU/Linux System After Upgrade.
Take into account that for an Upgraded Kubuntu EFI System Recovery a Grub 2 Bootloader Re-Installation May be Needed.
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Boot System with a Live Kubuntu Same as Your System.
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Open a Shell Terminal Emulator Window
Alt+Space > Type “kons” > Return
(Press “Enter” to Execute Commands)
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Possibly to Find the Volume to Fix (LVM or Ordinary Partition)
sudo apt-get install lvm2
So now Execute a Disk Scan to Find out existing Partitions:
lvmdiskscan
In the Output you should be able to Recognize your Device…
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Chrooting into Kubuntu System.
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Mounting the Root.
sudo su
mount /dev/[sdAX] /mnt/
For Example:
mount /dev/sda2 /mnt/
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Then Only if Boot is in a Separate Partition: Mounting the Boot
mount /dev/[sdaY] /mnt/boot
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Mounting Proc,Dev & Sys.
mount -t proc none /mnt/proc
mount -o bind /dev /mnt/dev
mount -t devpts none /mnt/dev/pts
mount -o bind /sys /mnt/sys
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Chrooting.
chroot /mnt/ /bin/bash
Testing Network Connection:
ping -c 3 google.com
If No Network Connection then Try:
exit
cp /etc/resolv.conf /mnt/etc/resolv.conf
And then Chroot Again!
chroot /mnt/ /bin/bash
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Updating Apt Repos.
apt-get update
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Fixing potential Unresolved Processes.
apt-get -f install
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Upgrading System Again.
apt-get upgrade
apt-get dist-upgrade
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Reinstalling GRUB 2 on Kubuntu EFI Systems
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Rebooting Kubuntu System.
exit
Possibly Eject the Live Kubuntu Media…
reboot now
