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"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.


From, 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.


You can open the Software Properties utility with sudo software-properties-gtk, go to "other software" tab and un-select the source related to the ppa you mentioned (transmissionbt)


run in terminal sudo apt-get update Take a note of the ubuntu repositories which are giving the problem Type in terminal sudo apt-get install vim cd /etc/apt sudo vim sources.list Identify those repositories and put a # in front of them to comment them out. If they are non ubuntu repositories, do cd /etc/apt/sources.list.d Identify the problem ...


Install with the following commands, sudo apt-get install unrar-free


Happenes after you used BleachBit with root access and cleaned App cache Data Open Ubuntu Software Center Click on updates tab Click on small refresh button located at the top-left corner Wait for it Refer pic for refresh button Everything will be back to normal


Check this video to know how to edit /etc/apt/sources.list: Using Terminal text editor program nano we can edit the file /etc/apt/sources.list. Open terminal and type: sudo nano /etc/apt/sources.list After making necessary changes, use the keyboard combination ctrl+o and after that press Enter to save the file to its ...


My question would be a what is the upside? You cannot upgrade from 15.10 to 16.10 directly. If the upgrade is something you don't want to do because you are afraid of maybe breaking something, the LTS version would be the better option due to its longer support. But as the others wrote, as long as you are careful and don't run services (or even better ...


You would be safe from viruses and malware, since anti-virus software is 3rd party and you would still be able to update them since the companies that made the software will keep providing you with new virus definitions. But....There are a lot of Linux black-hats out there who would just love to hack into your computer. And because Canonical will no longer ...

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