To enable extensions, verify that they are enabled in your .ini files:

0
273

I was facing the same issue after upgrading to ubuntu 16.04 which by default comes with php7. I was able to resolve it by running the following commands Run the update command:

They mycript is missing and needs to be installed:

Run the upgrade command:

Install the php-mbstring which is also missing:

Install the phpunit which is also missing: