Upgrade PHP version 5.6 -> 7 issues on Linux : <p>Maybe its an old question, but i have some difficulties installing php 7 on my ubuntu environment. Right now I have ubuntu 15.10 and this is php version:</p>

<pre><code>PHP 5.6.11-1ubuntu3.4 (cli) 
Copyright (c) 1997-2015 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2015 Zend Technologies
    with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2015, by Zend Technologies
</code></pre>

<p>I tried this method to install it: </p>

<pre><code>sudo add-apt-repository ppa:ondrej/php
</code></pre>

<p>and this was the result:</p>

<pre><code>gpg: keyring `/tmp/tmpp_pz87v9/secring.gpg' created
gpg: keyring `/tmp/tmpp_pz87v9/pubring.gpg' created
gpg: requesting key E5267A6C from hkp server keyserver.ubuntu.com
gpg: /tmp/tmpp_pz87v9/trustdb.gpg: trustdb created
gpg: key E5267A6C: public key "Launchpad PPA for Ondřej Surý" imported
gpg: Total number processed: 1
gpg:               imported: 1  (RSA: 1)
OK
</code></pre>

<p>afther I executed this: <code>sudo apt-get update</code> and then: </p>

<pre><code>sudo apt-get install php7.0
</code></pre>

<p>and the result of the last command is: </p>

<pre><code>Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package php7.0
E: Couldn't find any package by regex 'php7.0'
</code></pre>

<p>I have no idea what should I do next ? can you help me? thx </p>
