12.04LTS -> 14.04LTS；Dist-升级失败；postgresql；删除黑名单

Question

我正在尝试将服务器从12.04LTS升级到14.04LTS，但它始终失败：

The package ... is in the removal blacklist. 

This can be caused by: 

* Upgrading to a pre-release version of Ubuntu 
* Running the current pre-release version of Ubuntu 
* Unofficial software packages not provided by Ubuntu 

If none of this applies, then please report this bug using the 
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.

在日志文件中，我看到：

ERROR Dist-upgrade failed: 'The package 'postgresql-8.3'
is marked for removal but it is in the removal blacklist.'

然而，我相信postgresql不再存在于机器上。我已经做了：

sudo apt-get remove postgresql
sudo apt-get remove postgresql-contrib-8.3
sudo apt-get purge postgresql
sudo apt-get autoremove

我删除了以下所有文件：

/etc/postgresql
/usr/lib/postgresql
/usr/share/postgresql

再次运行“删除/清除”将提供：

sudo apt-get purge postgresql

do-release-upgrade仍然以同样的方式失败。

有人能告诉我吗？

Answer 1

我编辑了文件：/var/lib/dpkg/status并删除了与包相关的块，例如：

Package: postgresql-8.3.....

继续到下一个空行。