[Solved] - Could not reliably determine the server's fully qualified domain name...

Error: 'AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message, ubuntu 14.04'

Solution: 

In new version of apache2 you just following command like this:

 sudo nano /etc/apache2/apache2.conf  

Add the following new line end of file:

 ServerName localhost  

Then restart apache2:

 sudo nano service apache restart  

It's done!

Source: http://askubuntu.com/questions/256013/could-not-reliably-determine-the-servers-fully-qualified-domain-name

Ubuntu Asking for FTP Credentials on Localhost while using Wordpress

If you are on a Ubuntu OS and have been using Wordpress on a localhost and been trying to install a plugin or a theme and then being asked for FTP credential, below is the solution:

 sudo chown -R www-data:www-data 'insert-filename-of-wordpress-installation'  

Problem solved!

[Solved] Samba Not Working in Ubuntu 15.04

If you are unable to run Samba in Ubuntu 15.05 follow the following steps:

Open up your Terminal and execute the following commands:

 CTRL+F2  
 gksu system-config-samba  

 sudo touch /etc/libuser.conf  

 CTRL + F2  
 gksu system-config-samba  

Source: http://ubuntuforums.org/showthread.php?t=2290002