How To Install Ubuntu 12.04 On Non-PAE Capable Hardware

Ubuntu 12.04 (as well as Kubuntu 12.04) uses the PAE Linux kernel by default for 32bit ISOs so old computers that don't support PAE can't boot the latest Ubuntu version. But there is a way to install Ubuntu 12.04 LTS Precise Pangolin on computers without PAE support: using the non-PAE netboot Minimal ISO (there are also some alternatives, see below).