catgate wrote:I was a bit wary of this because of the word "upgrade" rather than "update".
I do not think my friend wants to leap into 14.04 yet (and certainly I don't).
update gets a fresh list of available packages, upgrade downloads and installs the latest version of packages for your chosen distro, while dist-upgrade gets packages that ordinary upgrade doesn't handle, like new kernel versions.
dist-upgrade can also upgrade you to a newer version of your distro if you change the sources to a those needed for a new version.
So you can use all three commands with impunity (unless there are any warnings which spring up to advise you to the contrary), indeed, you need to run update first anyway.