Dpkg: error processing archive couchbase-release-1.0-4-amd64.deb (--install):


i’m trying to install Couchbase server on a virtual machine (virtual box) running
Ubuntu Server 18.04 (GNU/Linux 4.15.0-23-generic x86_64).
Following this guide, if i run

sudo dpkg -i couchbase-release-1.0-4-amd64.deb

console shows me:

(Reading database ... 103765 files and directories currently installed.)
Preparing to unpack couchbase-release-1.0-4-amd64.deb ...
Supported platforms are: Debian/wheezy,jessie and Ubuntu/lucid,precise,trusty,xenial

dpkg: error processing archive couchbase-release-1.0-4-amd64.deb (--install):
 new couchbase-release package pre-installation script subprocess returned error exit status 1
Errors were encountered while processing:

What am i missing?
I’ve already tried the docker solution and it worked, and now i would like to install permanently because i’d like to test it in “production mode”.

NB: i checked out this topic, and it seemed having the same problem. I checked systemd, and it’s on pid 1, so it should’t be that.

Thank you in advance