I would like to install: i3blocks.
But when I try:
sudo apt-get install i3blocks I get:
E: Unable to locate package i3blocks
How to fix this?
p.s.: I am on Ubuntu 14.04 LTS
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As you can see from the link you provided, package
i3blocks is not available for 14.04 (trusty), only for vivid (15.04), wily (15.10) and the next release vivid (16.04). There are also no backports available.
Installing the package for one of the later Ubuntu releases is generally not recomended, as it may break your package db and prevent you from installing other packages or upgrading your currently installed ones.
If you do not want to wait until 16.04 is released you can clone this repo: https://github.com/vivien/i3blocks and build it yourself. Look at the documentation if you don't know how to get it built.
This guide here was helpful when I went that route: http://kumarcode.com/Colorful-i3/, however, you are going to have to tweak a few things to get it working. The scripts and icons that he provides are pretty useful.