The 'Galileo' site must be added, click 'Add.' and input:.

Install PHP Development Tools (PDT): Open Eclipse (you must specify your workspace) ignore the 'Welcome to Eclipse' screen is displayed, select menu Help/Install New Software.

Install Eclipse: Open Synaptic Package Manager (System/Administration/Synaptic Package Manager), Find the package 'eclipse' and mark it for installation, Click Apply. If you have problems or want 'lower risk to re-do', run, at the second step bellow, the Eclipse with root,

NOTE: On Ubuntu 10+ this method will install Eclipse 3.5+ (Galileo) and PDT 2.1+. PS: 'PDT - PHP Development Tool' is the official name for 'Eclipse-PHP'. (Pascal's answer says 'Don't use apt-get' but I say) UBUNTU supports and I recommend: USE IT, use apt-get! Is faster, simple and secure! Run Eclipse and use the Help/Add to add the PHP-Eclipse (PDT) package. Use 'software centre' or Synaptic to install Eclipse. and I have problems with the other 'handmade methods' answered here.

I think there are the SIMPLEST one for UBUNTU 10+.

Eclipse ubuntu