read-only php.ini file is preventing saving new configuration

Question

I've installed "PHP PECL EXTENSION/MODULE ON UBUNTU". At the end, I was asked to add some configuration lines in the a file called php_ini that can be found in this path:

/etc/php5/apache2/php.ini

However, after making my changes, I can't save the file because the file is read-only.

What the appropriate action to save my changes. I don't really why the file is read-only, I don't know if there is some thing I need to do. I'm new in Ubuntu/php

Thanks for helping.

Answer 1

For accessing the system files you need root permission.So you would need to use sudo command.it would be like sudo vim /etc/php5/apache2/php.ini(if u are using vim editor) as user2075215 mentioned in comment.

Answer 2

Use command: "sudo gedit /etc/php5/apache2/php.ini"
It will open text editor, change your settings and save with ctrl+s and close the editor.
All changes will be saved.