Tried to move blogs to a new server – “white screen of death”

You may not have configured Apache. Add this line in your apache2.conf file:

AddType application/x-httpd-php .php .htm .html

Evidently, you should make sure you actually have installed and activated the PHP module first and foremost (the above Apache directive might not even be necessary in this case). In this regard, you can visit the /etc/apache2/mods-enabled/ folder and look for the php5.load, php5.conf files.