MAAS 2.0 is only supported on Ubuntu 16.04 LTS (Xenial Xerus). This is because 16.04 defaults to Python 3, whereas previous versions of Ubuntu defaulted to Python 2.
MAAS 1.9 will continue to be supported on Ubuntu 14.04 LTS (Trusty Tahr) until the latter reaches the end of its support cycle. See Ubuntu Releases for release and EOL dates for all Ubuntu versions.
Upgrading from 1.9 to 2.x will therefore involve upgrading the version of Ubuntu to 16.04 LTS. In so doing, the MAAS database and MAAS configuration will be migrated. See the Xenial Release Notes for upgrading to Xenial.
Prior to the upgrade all packages should be updated (
sudo apt-get update &&
sudo apt-get dist-upgrade). It is recommended that backups be made and that
a test environment (that mirrors your production environment) be upgraded first, to
pre-empt any issues.
The upgrade process can be complex, and depending on your installation, may require manual intervention. You may be asked whether you want to overwrite some files, PostgreSQL files in particular, especially if you've implemented high availability in PostgreSQL (see PostgreSQL HA). If you've made no modifications to these files, you can instruct the upgrade process to overwrite them. Otherwise, you'll need to merge the new changes into the files manually.
At the end of the upgrade, if you see processing errors with the
maas-region-controller packages, or if the upgrade
complains about unmet dependencies with the MAAS packages, try the following:
sudo apt -f install sudo apt autoremove sudo apt upgrade
This should fix the dependency errors, remove redundant packages and update to the latest version of MAAS.