Ubuntu下Postgresql卸载出错的解决办法

Removing postgresql-9.1 (9.1.18-0ubuntu0.12.04) ...
/var/lib/dpkg/info/postgresql-9.1.prerm: 9: .: Can't open /usr/share/postgresql-common/maintscripts-functions
dpkg: error processing package postgresql-9.1 (--remove):
 子进程 已安装 pre-removal 脚本 返回了错误号 2
dpkg: postgresql-client-9.1: dependency problems, but removing anyway as you requested:
 postgresql-9.1 依赖于 postgresql-client-9.1.

Removing postgresql-client-9.1 (9.1.18-0ubuntu0.12.04) ...
/var/lib/dpkg/info/postgresql-client-9.1.prerm: 10: .: Can't open /usr/share/postgresql-common/maintscripts-functions
dpkg: error processing package postgresql-client-9.1 (--remove):
 子进程 已安装 pre-removal 脚本 返回了错误号 2
/var/lib/dpkg/info/postgresql-client-9.1.postinst: 7: .: Can't open /usr/share/postgresql-common/maintscripts-functions
dpkg：清理时出错:
 子进程 已安装 post-installation 脚本 返回了错误号 2
在处理时有错误发生：
 postgresql-9.1
 postgresql-client-9.1
E: Sub-process /usr/bin/dpkg returned an error code (1)

sudo rm -r /var/lib/dpkg/info/postgresq*

sudo apt-get autoremove postgresql*

dpkg：警告：files list file for package 'postgresql-9.1' missing; assuming package has no files currently installed
dpkg：警告：files list file for package 'postgresql-client-9.1' missing; assuming package has no files currently installed
(正在读取数据库 ... 系统当前共安装有 146453 个文件和目录。)
Removing postgresql-9.1 (9.1.18-0ubuntu0.12.04) ...
Removing postgresql-client-9.1 (9.1.18-0ubuntu0.12.04) ...