dpkg-reconfigure 中的“-plow”选项有什么作用

从您链接的手册页dpkg-reconfigure：

-p值，--优先级=值
   指定将显示的问题的最低优先级。dpkg-重新配置
   无论您的默认优先级是什么，通常都会显示低优先级的问题。看
   debconf (7) 获取列表。

从man 7 debconf：

Another  nice feature of debconf is that the questions it asks you are prioritized. If you
don't want to be bothered about every little thing, you can set up debconf to only ask you
the most important questions.  On the other hand, if you are a control freak, you can make
it show you  all  questions.  Each  question  has  a  priority.  In  increasing  order  of
importance:

low    Very  trivial  questions  that have defaults that will work in the vast majority of
       cases.

medium Normal questions that have reasonable defaults.

high   Questions that don't have a reasonable default.

critical
       Questions that you really, really need to see (or else).

Only questions with a priority equal to or greater than the priority you  choose  will  be
shown  to  you. You can set the priority value by reconfiguring debconf, or temporarily by
passing  --priority=  followed  by  the  value  to  the  dpkg-reconfigure(8)   and   dpkg-
preconfigure(8) commands, or by setting the DEBIAN_PRIORITY environment variable.

因此，-plow将显示所有问题，而不管其他地方可能设置了什么默认值。这可能是你想要的（当我跑步时，这通常是我dpkg-reconfigure想要的）。