offline upgrade failed when data folders have been removed. but as a result is new version was installed when start node manually

http://qa.hq.northscale.net/view/2.0.1/job/ubuntu-64-2.0-upgrade/82/consoleFull
./testrunner -i /tmp/upgrade.ini upgrade_version=2.0.1-150-rel,initial_vbuckets=64 -t newupgradetests.MultiNodesUpgradeTests.offline_cluster_upgrade_non_default_path,data_path=|tmp|data,index_path=|tmp|index,initial_version=2.0.0-1976-rel,items=10,nodes_init=3,num_nodes_remove_data=1,replicas=2

steps:
1. 3 nodes in cluster 2.0.0-1976-rel:
for node 10.3.3.19 data paths are :data_path=/tmp/data,index_path=/tmp/index
2. stop all nodes
3. on node 10.3.3.19 delete folders /tmp/data and /tmp/index
4. upgrade all nodes on 2.0.1-150-rel

result for node where data was removed:
root@ubu-2502:/tmp# dpkg -i /tmp/couchbase-server-enterprise_x86_64_2.0.1-150-rel.deb
(Reading database ... 68049 files and directories currently installed.)
Preparing to replace couchbase-server 2.0.0 (using .../couchbase-server-enterprise_x86_64_2.0.1-150-rel.deb) ...

• Failed to stop 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 ...
  Setting up couchbase-server (2.0.1) ...
  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@10.3.3.19
  ERROR: dbdir is not a directory: /tmp/data
  dpkg: error processing couchbase-server (--install):
  subprocess installed post-installation script returned error exit status 1
  Processing triggers for ureadahead ...
  Errors were encountered while processing:
  couchbase-server

observation:
start server mannualy:
root@ubu-2502:/tmp# /etc/init.d/couchbase-server start

• Started couchbase-server

installed version is 2.0.1-150-rel

the same test on centos is fine