为什么我无法安装 gdm3

Question

不幸的是我删除了 gdm3。所以我想重新安装它，但当我尝试安装它时，我看到了此消息。

The following packages have unmet dependencies:
gdm3 : Depends: libgdm1 (= 3.28.0-0ubuntu1) but 3.28.3-0ubuntu18.04.4 
is to be installed
    Depends: gir1.2-gdm-1.0 (= 3.28.0-0ubuntu1) but 3.28.3- 
 0ubuntu18.04.4 is to be installed
E: Unable to correct problems, you have held broken packages.

有人知道这是什么问题吗？