Установка сервера Postgresql не работает из-за ошибки postgresql-common

Установка сервера postgresql в Ubuntu 12.04 завершается с ошибкой. Похоже, что это связано с неполной конфигурацией пакета postgresql-common. Я очистил все пакеты, связанные с postgresql, попытался переустановить только пакет postgresql-common.

Ошибка:

$ sudo apt-get install postgresql-common
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following NEW packages will be installed:
  postgresql-common
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/96.5 kB of archives.
After this operation, 442 kB of additional disk space will be used.
Preconfiguring packages ...
Selecting previously unselected package postgresql-common.
(Reading database ... 176855 files and directories currently installed.)
Unpacking postgresql-common (from .../postgresql-common_129ubuntu1_all.deb) ...
Adding 'diversion of /usr/bin/pg_config to /usr/bin/pg_config.libpq-dev by postgresql-common'
Processing triggers for ureadahead ...
Processing triggers for man-db ...
Setting up postgresql-common (129ubuntu1) ...
adduser: The user `postgres' does not exist.
dpkg: error processing postgresql-common (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 postgresql-common
E: Sub-process /usr/bin/dpkg returned an error code (1)

Любая идея, как ее преодолеть или решить?

NB: