Nota Bene

Everyday, there are always new things to learn, even just at reading the comments from /etc/apt/sources.list:

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## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.

“N.B.” is an abbreviation for nota bene, a Latin expression meaning “note well”. N.B. every detail matters.