Lubuntu is based on Ubuntu — it’s an Ubuntu derivative, which means it’s based on the same software as Ubuntu but it includes a different graphical desktop environment and included software. Lubuntu is the most lightweight derivative of Ubuntu, including the lightweight LXDE desktop instead of Ubuntu’s default Unity desktop. Because it’s based on Ubuntu, you can install programs from Ubuntu’s software repositories. The Ubuntu compatibility may also be useful if you ever need to find information about a problem — the web is full of tips for troubleshooting and tweaking Ubuntu, and many of them will also apply to Lubuntu.
This distribution is a bit heavier than Puppy. For example, it includes the full Firefox Web Browser — instead of more lightweight web browsers like Puppy Linux and VectorLinux Light. Its documentation says it requires at least 256 MB of RAM for daily use, but 512 MB is recommended. It will take up more disk space when installed, too.
Lubuntu is a fast and lightweight operating system. The core of the system is based on Linux and Ubuntu. Lubuntu uses the minimal desktop LXDE, and a selection of light applications. We focus on speed and energy-efficiency. Because of this, Lubuntu has very low hardware requirements. Lubuntu was founded by Mario Behling and is currently mainly developed by Julien Lavergne.
Lubuntu 15.04 ISO Download[Download lubuntu (Intel x86) desktop CD] — For almost all PCs. This includes most machines with Intel/AMD/etc type processors and almost all computers that run Microsoft Windows, as well as newer Apple Macintosh systems based on Intel processors. Choose this if you are at all unsure. [Download lubuntu 64-bit (AMD64) desktop CD] — Choose this to take full advantage of computers based on the AMD64 or EM64T architecture (e.g., Athlon64, Opteron, EM64T Xeon, Core 2). If you have a non-64-bit processor made by AMD, or if you need full support for 32-bit code, use the Intel x86 images instead.
PCs with the Windows 8 logo or UEFI firmware, choose the 64-bit download.
—[Mac (PowerPC) and IBM-PPC (POWER5) desktop image]
For Apple Macintosh G3, G4, and G5 computers, including iBooks and PowerBooks as well as IBM OpenPower machines.
Puppy Linux is designed to be extremely lightweight. When installed to a USB flash drive, it consumes only 100 MB of space — 256 MB if you want the version with a full OpenOffice office suite instead of more lightweight office applications. Puppy Linux is loaded to your computer’s RAM when you boot it up, so it will run entirely from RAM and be as snappy as possible. The computer’s old, slow hard drive won’t be a factor. You can even save your files and customizations to the USB drive containing Puppy Linux — there should be plenty of space considering how small Puppy Linux is.
Puppy Linux has very low minimum system requirements and requires only 128 MB of RAM, although at least 256 MB of RAM is recommended. It offers the most basic applications you’d expect — an extremely lightweight web browser named Dillo, and other programs like an email client, media player, text editor, and image editor. It uses the Openbox window manager by default.