I currently am using the Acquia Drupal installation profile on a site, and I want to convert it to a vanilla Drupal install. Other than cross referencing the modules that come with the profile, and making sure you download those from drupal.org and putting them into sites/all/modules, are there anymore steps that would need to be taken besides your regular update instructions?
Once a Drupal site is installed, it doesn't really matter which installation profile you used. The only difference is that it's possible to use modules and themes that are located in the profiles folder. So in that sense you are running vanilla Drupal.
If you want to disable the possibility to use the modules from the profile you need to, once you have added the modules to sites/all, set the installation profile to "standard". The easiest way to that is to use drush:
$ drush vset install_profile standard
Copying only modules doesn't help, but will closer. Installation profiles also run DB changes, so you need reproduce settings from code.
Just move the module files from the installation profile to sites/all/modules before you run the installation. After the installation you could even delete the profile.
here are some modified steps from This article: http://davehall.com.au/blog/dave/2012/09/12/switching-installation-profiles-existing-drupal-sites that worked for me.
$ drush vset -y install_profile my_profile
An alternative way of doing this is by directly manipulating the database. You can run the following SQL on your Drupal database to switch installation profiles:
UPDATE variable SET value = 'my_profile' WHERE name = 'install_profile'; -- Clear the cache using MySQL only syntax, when DB caching is used. TRUNCATE cache;
Also you should:
echo "UPDATE system s SET schema_version = 0 WHERE s.name = 'my_profile'" | drush sqlc && drush cc all
Before you switch installation profiles, you should check that you have all the required modules enabled in your site. drush en $(grep depedencies /path/to/my-site/profiles/my_profile/my_profile.info | sed -n 's/depedencies=(.*)/\1/p')