[Solve] Problem AH00558 When Restarting Apache2

I'm trying to restart apache2 using this command:

sudo service apache2 restart

or

sudo /etc/init.d/apache2 restart

But get below error:

AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1.

So, how to fix this problem?

[Solve] "The mcrypt extension is missing. Please check your PHP configuration" Phpmyadmin Error in Ubuntu 13.10

I've done installation phpmyadmin on Ubuntu 13.10 with apache web server. I restarted apache2 and after login to phpmyadmin, on the bottom of the page show this error: "The mcrypt extension is missing. Please check your PHP configuration." like screenshot below:

So, how to fix this problem?

[Solved] "/bin/rm: cannot remove `/run/user/root/gvfs': Is a directory" When exit from root / superuser

This problem occurs when we have entered in the root or superuser, then when trying to exit, show this information "/bin/rm: cannot remove '/run/user/root/gvfs': Is a directory" like image below:

So, how can fix this?

Tutorial: Install Google Chrome in Ubuntu

In this article, we use Ubuntu 13.04. By default web browser in Ubuntu 13.04 is Mozilla Firefox. If you need another web browser, like google chrome, so we have to install it manually.