Why I can't install php5 modules on Ubuntu 16.04?


I have just finished setting up my Ubuntu 16.4 server. I have installed php5.6.26 because I am going to use Wordpress and I am not sure if all plugins are compatible with php7.

I need to install some php modules like php-xmlrpc or another module. When I type

sudo apt-get install php-curl php-gd php-mbstring php-mcrypt php-xml php-xmlrpc

This command is from this article on DO [How To Install WordPress with LAMP on Ubuntu 16.04] I get this message

 sudo apt-get install php-curl php-gd php-mbstring php-mcrypt php-xml php-xmlrpc
Reading package lists... Done
Building dependency tree
Reading state information... Done
php-gd is already the newest version (
The following additional packages will be installed:
  libcurl3 libxmlrpc-epi0 php7.0-curl php7.0-mbstring php7.0-mcrypt php7.0-xml php7.0-xmlrpc
The following NEW packages will be installed:
  libcurl3 libxmlrpc-epi0 php-curl php-mbstring php-mcrypt php-xml php-xmlrpc php7.0-curl php7.0-mbstring
  php7.0-mcrypt php7.0-xml php7.0-xmlrpc
0 upgraded, 12 newly installed, 0 to remove and 11 not upgraded.
Need to get 869 kB of archives.
After this operation, 2,943 kB of additional disk space will be used.
Do you want to continue? [Y/n]

Honestly I don’t want to use php7 and I have already explained why. How can I install the modules of php5, not php7?

What is the difference between modules for php7 and for php5? Can I still use php5 while the modules are for php7?

Thank you very much :)

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As of Ubuntu 16.04.x default PHP version is PHP7. You should add PHP5 repository and you will be able to install it.

First of all add repository :

  1. sudo add-apt-repository ppa:ondrej/php

When it finishes update apt:

  1. sudo apt-get update

After that executing

  1. sudo apt-get install php5.6

You can also install any php package, but you need to refer as php5.6 instead of php, e.g. php5.6-mbstring instead of php-mbstring.

Also note: remove all php7 packages

I have 404 error on ppa:ondrej/php ppa. Is it some other way to install php5.5 on ubuntu 16…04?

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