This article gives instructions for upgrading your MAAS installation. Please also check the installation notes at the end of this document.
When installing MAAS on Ubuntu, there can be conflicts between the existing NTP client, systemd-timesyncd, and the NTP client/server provided by MAAS, chrony. This can lead to time synchronization issues, especially if MAAS is configured with different upstream NTP servers than the ones used by systemd-timesyncd. To avoid conflicts, users can manually disable and stop systemd-timesyncd using the following command:
sudo systemctl disable --now systemd-timesyncd
Also note that support for PostgreSQL 12 has been deprecated in MAAS 3.3 and will be discontinued in MAAS 3.5.