What is Nix package manager?
Nix package manager solves the problem of inconsistent, incomplete package state by enforcing complete state by default. Nix provides atomic upgrades and rollbacks, side-by-side installation of multiple versions of a package, multi-user support, per-user profiles, and improved conflicts resolution. It also has powerful user environment management which makes it easy to work with multiple profiles.
What is Ubuntu?
Ubuntu is a Linux-based operating system that runs from the desktop, to the cloud, to all your internet connected things in between. Perfect for home users, students and hackers alike, its easy-to-use interface puts you in control of your machine. Users can run Ubuntu on a computer, or in a virtual machine on top of their existing operating system. There are three editions: 'Ubuntu Desktop Edition' for personal computers, the 'Ubuntu Server Edition', and the lightweight 'Ubuntu Core' edition for embedded devices and appliances.
Publish Ubuntu packages on Nix package manager with packagecloud
If you’re looking to publish Ubuntu packages on Nix package manager, you can use packagecloud to handle all of your package management. Packagecloud works with all kinds of packages, not only Ubuntu packages. With packagecloud you can manage all of your packages from various OS’s, languages, and more. Always trust that your packages will be secure when you publish your Ubuntu packages on Nix package manager via packagecloud.
Nix package manager also integrates with

Archlinux

CentOS

Debian

Fedora

Gentoo

Java

Javascript

Kubuntu

Lubuntu

Manjaro

OpenSUSE

Python

Red Hat

Red Hat Enterprise Linux

Ruby

Slackware

SuSe

Xubuntu

Archlinux

CentOS

Debian

Fedora

Gentoo

Java

Javascript

Kubuntu

Lubuntu

Manjaro

OpenSUSE

Python

Red Hat Enterprise Linux

Red Hat

Ruby

Slackware

SuSe

Ubuntu

Xubuntu