有时候，sudoers并不是控制Ubuntu和其他Linux发行版上用户权限的唯一方法，Polkit允许对权限进行更细粒度的控制，
/etc/polkit-1/localauthority.conf.d/ 假设是99-custom.conf )，包含：
[Configuration]
AdminIdentities=unix-user:Y
$ pkexec bash -l
==== AUTHENTICATING FOR org.freedesktop.policykit.exec ===
Authentication is needed to run `/bin/bash' as the super user
Authenticating as: muru,,, (muru)
Password:
==== AUTHENTICATION COMPLETE ===
由于你是管理员用户，pkexec将提供以下选项：
$ pkexec bash
==== AUTHENTICATING FOR org.freedesktop.policykit.exec ===
Authentication is needed to run `/bin/bash' as the super user
Multiple identities can be used for authentication:
1. X,,, (Y)
2. Y,,, (X)
Choose identity to authenticate as (1-2):
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