installs on systems with less than about 384MiB of RAM (although note that low-memory systems may not be able to run a full desktop environment reasonably).
upgrading from older installations without network access.
It provides for the following situations: The alternate install ISO image allows you to perform certain specialist installations of Ubuntu.
Ubuntu 12.04.5 LTS - Precise Pangolin - 32-bit PC (i386) server install image.
Ubuntu 12.04.5 LTS - Precise Pangolin - 64-bit PC (AMD64) server install image.
If you have a non-64-bit processor made by AMD, or if you need full support for 32-bit code, use the i386 images instead (choose this if you are at all unsure). Please take into account that the AMD64 releases should only be considered for those computers based upon AMD64 or EM64T architecture (e.g., Athlon64, Opteron, EM64T Xeon, Core 2). For those who need them, here are the official URLs to download the ISO images for all the most recent Ubuntu releases (desktop & server, i386 or AMD64).