已在 Supermicro 服务器上安装了 Ubuntu 16.04。安装时chrony，我收到以下消息：
root@xxx:~# apt-get install chrony
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:
chrony : Depends: libtomcrypt0 but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
尝试运行apt-get install -f但并未解决问题：
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
运行dpkg --get-selections | grep hold，但没有结果。
运行dpkg --configure -a后我仍然收到相同的错误。