在尝试解决问题的过程中，当我打算删除/etc/sysctl.conf时，我不小心删除了/sbin/sysctl。
当我运行时sysctl，我收到错误消息
The program 'sysctl' is currently not installed. You can install it by typing:
sudo apt-get install procps
当我尝试两者时install，upgrade它说procps is already the newest version。我也尝试删除 procps 并重新安装它，但出现此错误：
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 …