You will need to tweak /etc/fstab to make it suitable for a cloud instance. Nova-compute may resize the disk at the time of launching instances based on the instance type chosen. This can make the UUID of the disk invalid. Hence we have to use file system label as the identifier for the partition instead of the UUID. Edit /etc/fstab and change the following line from
UUID=e7f5af8d-5d96-45cc-a0fc-d0d1bde8f31c / ext4 errors=remount-ro 0 1
to
LABEL=uec-rootfs / ext4 defaults 0 0
