There are many questions about Unable to locate package.
For example : if user try to install package by using apt-get then the following error shown. (Here package is used only as example for displaying error message):
sudo apt-get install package
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package package
What does this error mean? How do I solve it?
Here provided General solution to understand and how to solve such type of error (which is helpful for new users that may unaware of repository-apt install mechanism)
Note : For resolving unmet-dependencies, visit: This question.
