dpkg 安装后脚本有错误

Question

我正在尝试测试我的 .deb 包是否安装正确，但我总是收到此错误：

dpkg (subprocess): cannot set security execution context for maintainer script: Invalid argument
dpkg: error processing package testpkg (--install):
 installed testpkg package post-installation script subprocess returned error exit status 2
Errors were encountered while processing:
 testpkg

这是什么？我的 postinst 脚本如下所示

#!/bin/bash
chmod +x /usr/bin/testpkg
exit 0

我非常困惑