I'm trying to install htop on my server (ubuntu 14.04). Here is the command:
sudo apt-get install htop
But it throws:
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package htop
Noted that it throws E: Unable to locate package .... for everything I would like to install (like phpmyadmin). What's the problem and how can I fix it?