UUID stands for Universally Unique IDentifier of a partition. This ID is used in a few different places to identify the partition. Most commonly this would be /etc/fstab.


How to Find UUID of Your Filesystems


To find the UUID of your partitions, you can use blkid command as shown.

# blkid|grep UUID


How to Change UUID of Your Filesystems


Changing UUID of a filesystem is fairly easy. To do this, we are going to use tune2fs. For the purpose of this tutorial, I will change the UUID on my second partition /dev/sdb1, yours may vary, thus make sure you are changing the UUID of the desired filesystem.


The partition has to be unmounted prior apply the new UUID:

# umount /dev/sdb1
# tune2fs /dev/sdb1 -U random /dev/sdb1 # blkid | grep sdb1


The UUID has been successfully changed. Now you can mount the filesystem back again.

# mount /dev/sdb1


You can also update your /etc/fstab if needed, with the new UUID.

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