我sudo apt-get upgrade在我的 12.04 服务器上运行，并且我已经被 PostgreSQL 依赖所困扰。
控制台输出（的sudo apt-get -f install）如下：
dpkg: dependency problems prevent configuration of postgresql-9.1:
postgresql-client-9.1 (9.1.7-0ubuntu12.04) breaks postgresql-9.1 (<< 9.1.7-0ubuntu12.04) and is installed.
Version of postgresql-9.1 to be configured is 9.1.6-1~precise2.
dpkg: error processing postgresql-9.1 (--configure):
dependency problems - leaving unconfigured
No apport report written because the error message indicates its a followup error from a previous failure.
Errors were encountered while processing:
postgresql-9.1
E: Sub-process /usr/bin/dpkg returned an error code (1) …