我已经使用 LAMP + Postfix + Dovecot 设置了一个新的 Ubuntu 18.04 LTS 服务器。几乎所有东西都正常工作，但我遇到了 dovecot 依赖项的问题。我已经安装了 dovecot-core，apt install dovecot-core但当我尝试添加 dovecot-mysql `apt install dovecot-mysql' 时，我收到以下错误。
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
dovecot-mysql : Depends: dovecot-core (= 1:2.2.22-1ubuntu2) but 1:2.2.33.2-1ubuntu4.1 is to be installed
E: Unable to correct problems, you have held broken packages.
我得到了与 dovecot-lmtpd 相同的错误
解决这个问题的最佳方法是什么？我可以下载旧版本的 dovecot 组件的二进制文件并手动安装它们，但我不确定这是否是最好的方法。