我目前正在尝试在 Ubuntu 18.04 上安装 libssl-dev，但我遇到了这个问题：
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:
libssl-dev : Depends: libssl1.1 (= 1.1.0g-2ubuntu4.3) but 1.1.1b-1 is to be installed
Recommends: libssl-doc but it is not going to be …