Upgrade Ubuntu Server 14.04 to 15.04 - in VMWare Work Station 10.0.1 build-1379776

Hi,
Follow below steps to upgrade Ubuntu Server (Not the desktop) from 14.04 to 14.10

Software I used :
Host   :   Windows -10
Guest : 14.04 server installed in VMWare Work Station.
Virtual Machine : VMWare 10.01

1) check update-manager-core is available or not from server command line editor.

2) If it is not available install it
   command :
       sudo apt-get install update-manager-core

3) Change Prompt=lts to Prompt=normal in release-upgrades file

4) File location : /etc/update-manager/release-upgrades
     Navigate to this directory do the point-3 changes.

5) Save the file and run below command to upgrade
    Upgrade command : sudo do-release-upgrade

6) It will check for new servers and if available upgrade starts

Thanks . Do you find it useful, If yes, share it.

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References : 
1) http://askubuntu.com/questions/5763/upgrading-from-the-command-line
2) http://www.ubuntu.com/

:-) :-)