When upgrading Ubuntu 14.04 LTS to 16.04 LTS the usual way, ‘do-release-upgrade’ will by default remove 3rd party packages. For a Zimbra/ZCS server this means that Zimbra/ZCS packages would be automatically removed when upgrading to Ubuntu 16.04 LTS. Luckily, there’s a neat little trick to prevent ‘do-release-upgrade’ from removing Zimbra/ZCS packages during the upgrade. Here’s … Continue reading How to upgrade Zimbra/ZCS 8.8 GA from Ubuntu 14.04 LTS to 16.04 LTS