Lubuntu is the lightest derivatives of Ubuntu so it specializes speed, support for older hardware.

Lubuntu has fewer packages by default consisting mostly of lightweight Linux applications.

What is the lightest Linux desktop environment?

One of the most famous lightweight GUIs over there, LXDE (Lightweight X11 Desktop Environment) was first released in 2006, it was programmed to work on Unix-like platforms like Linux & FreeBSD, LXDE is the default GUI for many Linux distributions like Lubuntu, LXLE, Knoppix any many others.

What is the lightest OS?

15 Best Lightweight OS for Old Laptop and Netbook in 2019

• Lubuntu. Those who want a super lightweight OS here is the first one on the list Lubuntu.
• Linux Lite. Another lightweight distro from the Linux family, Linux Lite.
• Puppy Linux.
• Damn Small Linux.
• Xubuntu.
• Debian + PIXEL.
• Bhodi Linux.
• Peppermint Linux.