Magento 2.0.1 update failed

[JSPeber]

Yesterday I tried to update my Magento 2.0 installation to version 2.0.1. The upgrade failed and i can't reach my admin panel no more. In the frontend i notice this error : Fatal error: Class 'Cm_Cache_Backend_File' not found in /home/mysite/public_html/vendor/magento/zendframework1/library/Zend/Cache.php on line 153

Before the upgrade was initiated a backup was made. I don't know how to roleback to my backup or to fix this error. 

[Dmitry_Fedyuk]

Is the lib/internal/Cm/Cache/Backend/File.php present?

[JSPeber]

No, it was not. As a solution i downloaded the backup that was created by the upgrade wizard and overwrited all files by FTP. Now my site was working again.  After that I tried to upgrade my installation directly to Magento 2.0.2 instead of 2.0.1 to upgrade without errors. But the upgrade failed to and I faced the same error. I overwrited the files again and my site is working again.

So both upgrades gave me the error: ErrorException] Source /home/mywebsite/public_html/vendor/magento/magento2-base/dev/tests/integration/.gitignore does not exist. And when I try to rollback my backup i got the Cm/Cache/Backend error.  I don't know how to solve the .gitignore error. The Magento installation was preinstalled by my hostingcompany.

Can someone help me please?

[waltonlucas]

This tool will help you migrate to any version of Magento easily http://tinyurl.com/zeqk3ue . If your site gets any error in migrating, this guys will help you to fix it.

[bmwsauberf1]

try copy vendor\magento\magento2-base\lib\internal\Cm folder to lib\internal

[Anjan Barik]

I faced the same issue while upgrading from 2.0.7 to 2.0.14 and it worked for me. many thanks for this solution.