$ /usr/lib/ubuntu-release-upgrader/check-new-release Checking for a new Ubuntu release New release '13.04' available. Run 'do-release-upgrade' to upgrade to it.
$ /usr/lib/ ubuntu- release- upgrader/ check-new- release upgrade' to upgrade to it.
Checking for a new Ubuntu release
New release '13.04' available.
Run 'do-release-