Running Drupal/Pressflow on Lucid.

As many of you know, Ubuntu Lucid shipped with PHP 5.3 which is incompatible with many Drupal 6 modules. The solution the Mercury team decided on was to pin PHP to 5.2 until the situation with 5.3 was resolved. Mercury 1.1 has this built in.

We've added all php5 packages to the file and are hosting it here: http://pantheon-storage.chapterthree.com/lucid

6/18/10 - found a bug and update the above file and the list below (for some reason, changing php5-imagick, php-apc and php5-memcache to karmic-updates caused it to fail)
6/15/10 - added updates from http://groups.drupal.org/node/75003 (view that page if you're using aptitude rather than apt-get)

Before we install php, we add the following to either /etc/apt/sources.list or a file in /etc/apt/sources.list.d/:

We then place a file called "php" in /etc/apt/preferences.d with the following contents:

This pins the latest version of php from karmic (5.2.10.dfsg.1-2ubuntu6.4) and allows one to run drupal/pressflow and modules without errors.

Lets say you want to add a new php package, say "php5-xdebug". Just running "apt-get install php5-xdebug: will give you an error, but if you add the following to the bottom of /etc/apt/preferences.d/php:

and re-run "apt-get update" and then "apt-get install php5-xdebug" the correct version of php5-xdebug will install.