I think I am spoiled with the ClearOS I was used to. I never experienced so many rough patches.
When I install by just going next next next you get everything on a 100Gb part of the LVM. Easy to resolve, but it makes no sense.
I ran into the issue that it doesn't support PPPoE with a fixed IP (
https://forum.zentyal.org/index.php/topic,35644.0.html) I now know it should work since under plain Ubuntu it works like I expected. I just don't know what happens if I mess with settings in the OS that do not align with the webinterface.
When making changes with the VLAN's (in the end I just gave up) and then going back to plain ethernet, you'll get all kind of issues, because Zentyal doesn't remove the VLAN settings, it just removes it from the interface.
Everything looks right, but things like DHCP/DNS/SAMBA just give up and won't start anymore.
And I am pretty sure there is a bug in the user/user rights.
If you make a user and then configure the rights, it probably works just fine. When you add 10 users and configure the rights, and then save. It becomes a lottery.
The webinterface tells everything is correct. But getting the client connected to the shares is a different thing. Completely random. like 3 of the 10 won't be able to connect to some share, sometimes even the personal one.
Luckily when you switch the Acces control from "read/write" to "administrator" or "read-only", save. Then switch it back and save again. Everything is works as expected.
I really believe Zentyal should use Beta testers.