Hello, I have the same issue, any progress on this one? Debian 9 became stable a while ago but your package still does not support it:
root@60cce784f1ec:/# lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 9.8 (stretch)
root@60cce784f1ec:/# dpkg -i couchbase-release-1.0-4-amd64.deb
(Reading database ... 30874 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):
subprocess new pre-installation script returned error exit status 1
Errors were encountered while processing: