I had problems with digital ocean , but I was using Debin 9. Everything installed just fine but we had several issues with fusionpbx. We had to move everything back Vultr.com. Let me know how it goes with Digital ocean.
We have about 300 of fanvils out to customers i have had only 1 go bad, Fanvil replace it. no issues just trying get the new one s to work with auto provisioning,,
X6U.