Laravel shows blank page on ubuntu, apache and php 7.0

When I tried to migrate one of my sites to the new cloud hosting, the blank page occurred. The new hosting had clean new ubuntu, apache 2 and PHP 7.0 installed.
Even after setting debug to true in app configuration file there was still blank screen. Laravel error log was also empty, so there was no information what was wrong.

The first step to fix this problem is to find some error information. To do this add the I added the following setting in Laravel index.php file.

ini_set('display_errors', 1);

After that the error messages finally showed up.

Now the first error message showed:
Call to undefined function Illuminate\Foundation\Bootstrap\mb_internal_encoding()

The fix for this was:

sudo apt-get install php7.0-mbstring

And after that restart of apache service

After this was fixed the next error showed up:

Use of undefined constant MCRYPT_RIJNDAEL_128

This was fixed by the following steps:

sudo apt-get update
sudo apt-get install mcrypt php7.0-mcrypt
sudo apt-get upgrade

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