Upgrading using the command line (eg Ubuntu Server):

11.10/13.10 and later

  • Run do-release-upgrade in a terminal

10.04/12.04

  • edit /etc/update-manager/release-upgrades and set Prompt=lts
  • Run do-release-upgrade in a terminal

 

Ref: http://askubuntu.com/questions/110477/how-do-i-upgrade-to-a-newer-version-of-ubuntu

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