Several non-Ubuntu Linux distributions are well-suited for low-spec laptops. Some of these include:

1. MX Linux: This distribution is based on Debian and uses the Xfce desktop environment. MX Linux is known for its balance between performance and ease of use, and it's an excellent choice for low-spec hardware.

1. Manjaro Linux: Manjaro is based on Arch Linux and offers multiple lightweight desktop environments, such as Xfce, LXQt, and i3. Manjaro has a user-friendly interface and provides access to the Arch User Repository (AUR), which contains a wide range of software.

1. Fedora LXDE or LXQt Spin: Fedora offers several "spins" with different desktop environments, including LXDE and LXQt. Both of these desktop environments are lightweight and suitable for low-spec hardware while providing access to Fedora's extensive software repositories.

1. Slackware Linux: This is one of the oldest Linux distributions still in active development. Slackware is known for its stability and simplicity, which can make it suitable for low-spec hardware. However, its manual approach to package management and system configuration may not be suitable for beginners.

1. Void Linux: Void Linux is an independent, rolling-release distribution that uses the runit init system and offers a minimal, lightweight base system. It provides multiple lightweight desktop environments, such as Xfce, LXQt, and Enlightenment.

When choosing a non-Ubuntu Linux distribution for a low-spec laptop, consider factors such as ease of use, available software, community support, and your own preferences and experience with Linux.
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