jj@testdev:/$ sudo aptitude remove postgresql-common postgresql-9.3 postgresql-9.4
The following packages will be REMOVED:
  libjs-node-uuid{u} libv8-3.14.5{u} node-async{u} node-cli{u} node-combined-stream{u} node-contextify{u} node-cookie-jar{u} node-cssom{u} node-delayed-stream{u} node-forever-agent{u} node-form-data{u}
  node-htmlparser{u} node-mime{u} node-node-uuid{u} node-qs{u} node-tunnel-agent{u} nodejs{u} pgdg-keyring{u} postgresql-9.3 postgresql-9.4 postgresql-common
0 packages upgraded, 0 newly installed, 21 to remove and 5 not upgraded.
Need to get 0 B of archives. After unpacking 45.0 MB will be freed.
Do you want to continue? [Y/n/?] Y
(Reading database ... 339191 files and directories currently installed.)
Removing postgresql-9.3 (9.3.5-2.pgdg14.10+1) ...
/var/lib/dpkg/info/postgresql-9.3.prerm: 9: .: Can't open /usr/share/postgresql-common/maintscripts-functions
dpkg: error processing package postgresql-9.3 (--remove):
 subprocess installed pre-removal script returned error exit status 2
Removing postgresql-9.4 (9.4.1-1.pgdg14.10+1) ...
/var/lib/dpkg/info/postgresql-9.4.prerm: 9: .: Can't open /usr/share/postgresql-common/maintscripts-functions
dpkg: error processing package postgresql-9.4 (--remove):
 subprocess installed pre-removal script returned error exit status 2
Removing node-node-uuid (1.4.0-1) ...
Removing libjs-node-uuid (1.4.0-1) ...
Removing node-tunnel-agent (0.3.1-1) ...
Removing node-qs (0.6.5-1) ...
Removing node-form-data (0.1.0-1) ...
Removing node-async (0.8.0-1) ...
Removing node-cli (0.4.4~20120516-1) ...
Removing node-combined-stream (0.0.5-1) ...
Removing node-contextify (0.1.6-1) ...
Removing node-cookie-jar (0.3.1-1) ...
Removing node-cssom (0.3.0-1) ...
Removing node-delayed-stream (0.0.5-1) ...
Removing node-forever-agent (0.5.1-1) ...
Removing node-htmlparser (1.7.5+ds1-1) ...
Removing node-mime (1.2.11-1) ...
Removing pgdg-keyring (2014.1) ...
Removing nodejs (0.10.25~dfsg2-2ubuntu1) ...
Removing libv8-3.14.5 (3.14.5.8-5ubuntu2) ...
dpkg: postgresql-common: dependency problems, but removing anyway as you requested:
 postgresql-9.4 depends on postgresql-common (>= 142~); however:
  Package postgresql-common is to be removed.
 postgresql-9.3 depends on postgresql-common (>= 142~); however:
  Package postgresql-common is to be removed.

Removing postgresql-common (166.pgdg14.10+1) ...
Can't locate PgCommon.pm in @INC (you may need to install the PgCommon module) (@INC contains: /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.20.1 /usr/local/share/perl/5.20.1 /usr/lib/x86_64-linux-gnu/perl5/5.20 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.20 /usr/share/perl/5.20 /usr/local/lib/site_perl) at /usr/bin/pg_lsclusters line 18.
BEGIN failed--compilation aborted at /usr/bin/pg_lsclusters line 18.
 * No PostgreSQL clusters exist; see "man pg_createcluster"
Removing 'diversion of /usr/bin/pg_config to /usr/bin/pg_config.libpq-dev by postgresql-common'
Processing triggers for man-db (2.7.0.2-2) ...
Processing triggers for doc-base (0.10.6) ...
Processing 1 removed doc-base file...
Processing triggers for libc-bin (2.19-10ubuntu2.3) ...
Errors were encountered while processing:
 postgresql-9.3
 postgresql-9.4
E: Sub-process /usr/bin/dpkg returned an error code (1)
Failed to perform requested operation on package.  Trying to recover:

Current status: 2 broken [-1].
jj@testdev