[Doc'd] during upgrade 2.0.0->2.1.0 with non default port get 'Failed to stop couchbase-server' in console on Ubuntu

Steps:

dpkg -i couchbase-server-enterprise_x86_64_2.0.0-1976-rel.deb
Selecting previously deselected package couchbase-server.
(Reading database ... 62014 files and directories currently installed.)
Unpacking couchbase-server (from couchbase-server-enterprise_x86_64_2.0.0-1976-rel.deb) ...
libssl0.9.8 is installed. Continue installing
Setting up couchbase-server (2.0.0) ...

• Started couchbase-server

You have successfully installed Couchbase Server.
Please browse to http://ubu-2502:8091/ to configure your server.
Please refer to http://couchbase.com for additional resources.

Please note that you have to update your firewall configuration to
allow connections to the following ports: 11211, 11210, 11209, 4369,
8091 and from 21100 to 21299.

By using this software you agree to the End User License Agreement.
See /opt/couchbase/LICENSE.txt.

Processing triggers for ureadahead ...

root@ubu-2502:/opt/couchbase/bin# ./couchbase-cli cluster-init --cluster=10.3.3.19:8091 -u Administrator -p password --cluster-init-user=Administrator --cluster-init-password=password --cluster-init-port=8099
SUCCESS: init 10.3.3.19

root@ubu-2502:/tmp# dpkg -i couchbase-server-enterprise_x86_64_2.0.2-760-rel.deb
(Reading database ... 68049 files and directories currently installed.)
Preparing to replace couchbase-server 2.0.0 (using couchbase-server-enterprise_x86_64_2.0.2-760-rel.deb) ...

=INFO REPORT==== 10-Apr-2013::01:47:20 ===
Initiated server shutdown** at node ns_1@127.0.0.1 **

=INFO REPORT==== 10-Apr-2013::01:47:26 ===
Stopped ns_server application** at node ns_1@127.0.0.1 **

• Stopped couchbase-server
  libssl0.9.8 is installed. Continue installing
  Minimum RAM required : 4 GB
  System RAM configured : 4060188 kB

Minimum number of processors required : 4 cores
Number of processors on the system : 4 cores
Upgrading previous couchbase ... (2.0.0)
Stopping previous couchbase ... (2.0.0)

• Failed to stop couchbase-server
  Saving previous couchbase config.dat ...
  Cleaning symlinks ...
  Unpacking replacement couchbase-server ...
  dpkg: warning: unable to delete old directory '/opt/couchbase/var/lib/couchbase/mnesia': Directory not empty
  Setting up couchbase-server (2.0.2) ...
  Upgrading couchbase-server ...
  /opt/couchbase/bin/install/cbupgrade -c /opt/couchbase/var/lib/couchbase/config -a yes
  Automatic mode: running without interactive questions or confirmations.
  Analysing...
  Previous config.dat file is /opt/couchbase/var/lib/couchbase/config/config.dat.debsave
  Target node: ns_1@127.0.0.1
  No buckets to be upgraded.
• Started couchbase-server

You have successfully installed Couchbase Server.
Please browse to http://ubu-2502:8091/ to configure your server.
Please refer to http://couchbase.com for additional resources.

Please note that you have to update your firewall configuration to
allow connections to the following ports: 11211, 11210, 11209, 4369,
8091, 8092 and from 21100 to 21299.

By using this software you agree to the End User License Agreement.
See /opt/couchbase/LICENSE.txt.

Processing triggers for ureadahead ...