One normal issue of WordPress migration from shared hosting to Google Cloud Platform VM is the broken permalink of WordPress entries. Just a quick fix for those who are looking (yeah I got this from Google too!):

Edit /etc/apache2/apache2.conf

Change from:

Options Indexes FollowSymLinks
AllowOverride None
Require all granted

to:

Options Indexes FollowSymLinks
AllowOverride all
Require all granted

Change .htaccess mod to 644, and restart the apache:

service restart apache2