lsb from network:messaging:zeromq:release-stable project

Select Your Operating System

For xUbuntu 12.04 run the following:
Keep in mind that the owner of the key may distribute updates, packages and repositories that your system will trust (more information).
echo 'deb /' | sudo tee /etc/apt/sources.list.d/network:messaging:zeromq:release-stable.list
curl -fsSL | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/network_messaging_zeromq_release-stable.gpg > /dev/null
sudo apt update
sudo apt install lsb

Packages for xUbuntu 12.04: