Recovering from Ubuntu dual boot issue | Chroot Ubuntu

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To recover from a windows installation first we need to boot from LiveCD of Ubuntu if you installed with system 32-bit use 32bit Live CD If 64bit use 64-bit live cd.

Mount the Linux partitions using

sysadmin@localhost:~$ sudo blkid
[sudo] password for sysadmin:
/dev/sda1: UUID="846589d1-af7a-498f-91de-9da0b18eb54b" TYPE="ext4"
/dev/sda5: UUID="36e2f219-da45-40c5-b340-9dbe3cd89bc2" TYPE="swap"
/dev/sda6: UUID="f1d4104e-22fd-4b06-89cb-8e9129134992" TYPE="ext4"

Here my / Partition is /dev/sda6, Mount the / partition to /mnt location.

# sudo mount /dev/sda6 /mnt

Then mount the Linux access points, Linux devices, proc, sys

Linux device

# sudo mount --bind /dev/ /mnt/dev

proc system information

# sudo mount --bind /proc/ /mnt/proc

Kernel information to user space

# sudo mount --bind /sys /mnt/sys

If we need to enable the networking we need to do the following steps.

# cp /etc/resolv.conf /mnt/etc/resolv.conf

Change the Linux root to be the device we mounted earlier in step 2

# sudo chroot /mnt

Then install the grub to write the new master boot record, Never point the partition to write the grub.

# sudo grub-install /dev/sda

This will fix the dual boot issue.

Recovering from Ubuntu dual boot issue | Chroot Ubuntu 1

About Author

Babin Lonston

Overall 14+ Years of experience in the IT field, currently working as a Senior Linux administration with Virtualization & Cloud. Being numismatist for a long time.
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