在手动删除以前安装的应用程序的文件夹后，apt-get不再工作。

Question

整个周末，我都在努力将现有的postgresql数据库从8.4版升级到9.1版。在我将操作系统从10.0.4更新到12.04之后，我已经拥有了两个版本的数据库。

最后，我变得愤怒起来，在错误的判断中，我强行从我的机器上删除了所有8.4个相关文件，使用：

find / -type d -name 8.4 2>/dev/null | xargs rm -rf {}

我决定把它删除的更好的方法应该是“`apt获取删除PostgreSQL8.4”

好吧，当我试着这样做的时候，会被举报的：

Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages will be REMOVED:
  postgresql-8.4
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 15.5 MB disk space will be freed.
Do you want to continue [Y/n]? y
(Reading database ... 304184 files and directories currently installed.)
Removing postgresql-8.4 ...
find: `/usr/share/postgresql/8.4/tsearch_data': No such file or directory
dpkg: error processing postgresql-8.4 (--remove):
 subprocess installed pre-removal script returned error exit status 1
Errors were encountered while processing:
 postgresql-8.4
E: Sub-process /usr/bin/dpkg returned an error code (1)

如何从计算机中清除postgresql 8.4？

[编辑]

在尝试apt-get install --reinstall postgresql-8.4之后，我得到以下错误：

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Suggested packages:
  oidentd ident-server
The following NEW packages will be installed:
  postgresql-8.4
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
Need to get 0 B/5,599 kB of archives.
After this operation, 15.5 MB of additional disk space will be used.
Selecting previously unselected package postgresql-8.4.
(Reading database ... 304010 files and directories currently installed.)
Unpacking postgresql-8.4 (from .../postgresql-8.4_8.4.14-0ubuntu12.04.2_amd64.deb) ...
Setting up postgresql-client-8.4 (8.4.14-0ubuntu12.04.2) ...
update-alternatives: error: alternative path /usr/share/postgresql/8.4/man/man1/psql.1.gz doesn't exist.
dpkg: error processing postgresql-client-8.4 (--configure):
 subprocess installed post-installation script returned error exit status 2
dpkg: dependency problems prevent configuration of postgresql-8.4:
 postgresql-8.4 depends on postgresql-client-8.4; however:
  Package postgresql-client-8.4 is not configured yet.
dpkg: error processing postgresql-8.4 (--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-client-8.4
 postgresql-8.4
E: Sub-process /usr/bin/dpkg returned an error code (1)

Answer 1

好吧，这真的非常非常糟糕，因为这里有一个依赖嵌套，它只是不会与通常的apt -- get清除、apt-get -f安装等一起消失。解决这个问题的唯一方法(我在VM中重新创建了您的问题并进行了测试)只是在那里放置了一个目录，以便在一开始就可以删除。

root@yourbox:/# mkdir -p /usr/share/postgresql/8.4/tsearch_data
root@yourbox:/# apt-get purge postgresql-8.4
root@yourbox:/# apt-get autoremove

有了一个要删除的空目录，父包的初始清除和子包的自动删除都完成，而我的VM中没有错误。

Answer 2

您最好从重新安装8.4开始：

sudo apt-get install --reinstall postgresql-8.4

然后你就可以用

sudo apt-get remove --purge postgresql-8.4

如果重新安装失败，请向我们显示错误。

Answer 3

要删除postgresql并从头开始，这对我起了作用：

列出所有已安装的postgresql包。

dpkg -l | grep post  

然后apt清除从上面命令返回的所有postgresql包：

示例：

apt-get purge postgresql postgresql-client postgresql-client-common postgresql-common postgresql-contrib postgresql-9.6 postgresql-client-9.6 postgresql-contrib-9.6