Upgrading 12.04 to 14.04 beta directly (without the intermediate 12.10 release)

I was trying to upgrade from 12.04 LT to 14.04 beta using update manager and using this command.

sudo do-release-upgrade --check-dist-upgrade-only --devel-release

But it is showing

Checking for a new Ubuntu release
New release '12.10' available.
Run 'do-release-upgrade' to upgrade to it

How can I skip the other versions and upgrade directly to 14.04 beta ?

Solution 1:

Looks like it checks for the next release, instead of the next lts release. You may need to edit /etc/update-manager/release-upgrades and set Prompt=lts.

To open the file for editing, run sudo nano /etc/update-manager/release-upgrades, after editing, pess ctrl-o to save, ctrl-x to exit.

Also make sure you have update-manager-core installed with
sudo apt-get install update-manager-core

info source

Solution 2:

1.install update-manager-core

sudo apt-get install update-manager-core

2.upgrade

sudo do-release-upgrade -d