Reading package lists... Done
Building dependency tree       
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
  git : Depends: liberror-perl but it is not going to be installed
        Depends: git-man (> 1:2.7.4) but it is not going to be installed
        Depends: git-man (< 1:2.7.4-.) but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or
specify a solution).

解决
执行

sudo apt install -f perl-base=5.22.1-9

再执行

sudo apt install git

https://askubuntu.com/questions/886765/cannot-install-git-on-ubuntu-16-04-lts