I would like to install PHP 5.4 with FPM on a 12.04 virtual machine. The popular PPA solution for installing PHP 5.4 doesn't seem to include the php5-fpm package.
What's the best way to install this version?
I will (ab)use already answered question: How do I install PHP 5.4.0?
You could use a ppa to stay up-to-date with php. I use :
https://launchpad.net/~ondrej/+archive/php5 
It's now on 5.4. If you want use this ppa do this:
ppa:ondrej/php5
(Click here for instructions on using PPAs.)
sudo add-apt-repository ppa:ondrej/php5
sudo apt-get update
sudo apt-get upgrade
If you don't have add-apt-repository binary do the following:
sudo apt-get install python-software-properties
For more, see the already answered question mentioned in the top.
If your system is 32 bit (old computers):
Go to this thread and select the latest version. Then download the file there is on the Downloadable files section
If your system is 64 bit (the most common by now):
Go to this thread and select the latest version. Then download the file there is on the Downloadable files section
Installing PHP from terminal:
Enter the following command:
sudo apt-get install php5-fpm
Compile your self:
In this web page you will found the download link with the packages.
Then you have to compile and install.
More information about the LAMP installation on Ubuntu 12.04