In a sources.list I see these comments:

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.

Anyone have an idea what "N.B." refers to?

2 Answers 2


From https://en.wikipedia.org/wiki/Nota_bene, N.B. in short means "pay attention" or "take notice". Therefore, the comment is telling you you should take note the software in that repository is not supported by Ubuntu.


"N.B." (Nota Bene) is a Latin form, in English you can read it as "Note well".

In this case, the sources.list file contains just a heads up for the users about the repository(ies). And the given note is self-explanatory i think as the Universe repository contains mostly the community contributions.

  • Thanks, I've been using Debian and Ubuntu for a long time, just wasn't familiar enough with the Latin notation to realize what N.B. was referring to. Jun 22, 2016 at 5:33
  • 1
    @Jonwithnoh Yeah, just a heads up like i said :)
    – heemayl
    Jun 22, 2016 at 5:34

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