Updates and lifecycle

Nubo OS 1 is built on Ubuntu 26.04 LTS, which has five years of security updates, to April 2031. Nubo OS inherits that period for the base system. Nubo’s own packages come from a signed Nubo archive. Nubo has not published a separate end-of-life date; treat April 2031 as the outer limit.

Where do updates come from?

Part	Source	Period
Ubuntu base system	Ubuntu’s archive through Nubo Cumulus, with Ubuntu’s servers as fallback	To April 2031
Nubo packages (nubo-*)	archive.nubosuite.tech, signed with the Nubo archive key	While Nubo OS 1 is maintained
Apps from Flathub	Flathub, through Flatpak	Set by each app’s publisher

Nubo OS does not include the Ubuntu Pro client, so Ubuntu’s extended maintenance past the standard period is not offered.

What are the channels?

Channel	Suite	Use
Stable	resolute	Default. Packages promoted from beta.
Beta	resolute-beta	Early packages for testers.

nubo-channel
sudo nubo-channel beta
sudo nubo-channel stable
sudo apt upgrade

The stable channel is empty today because Nubo OS 1 is still in beta.

Are security updates automatic?

Yes. The nubo-archive package turns on automatic installation of Nubo and Ubuntu security updates. Automatic reboots are off.

Can I upgrade to a later release?

Release upgrades are not available yet. The Ubuntu release-upgrade prompt is switched off, so do not run do-release-upgrade. Nubo will document the path when a later release exists.

Can I avoid Nubo Cumulus?

Yes, but the documented method (create /etc/nubo/no-cumulus and reinstall nubo-archive) does not restore Ubuntu’s source file on a machine that already switched. See the known issues page.