Could not find libv8-3.16.14.9 in any of the sources

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Problem

You are trying to upgrade one of your gems (ie uglifier) and at the same time you are using a new gemset (ie for rails 4.2.4), and you get the following error when you are trying to bundle:

Solution

Upgrade to rails 4.2.4 first and bundle and afterwards change the other gem and do bundle again.

Find out how your Linux system was booted (with what command)

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If you would like to know how your linux system was booted type the following to give you the information that you need:

Terminate/Kill unused guest sessions in linux

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Problem

You have started a couple of guest linux sessions on your pc, that you do not need anymore (ie giving access to your children while on holiday 🙂 ), and you want to close them from your own session.

Solution

Find out about the guest users by using who:

and then kill the sessions using pkill: