debconf-i18n は debconf (= 1.5.58ubuntu2) に依存します。ただし、システム上の debconf のバージョンは 1.5.58ubuntu1 です。

Question

Ubuntu 16.04にgitをインストールしようとしたとき、

 sudo apt-get install git

debconf-i18n : Depends: debconf (= 1.5.58ubuntu2) but 1.5.58ubuntu1 is to be installed
 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).

この問題を解決するには、

sudo apt-get install --reinstall debconf=1.5.58ubuntu2

しかし、次のようなエラーが発生しました。

/var/lib/dpkg/info/debconf.prerm: 15: /var/lib/dpkg/info/debconf.prerm: pyclean: not found
dpkg: warning: subprocess old pre-removal script returned error exit status 127
dpkg: trying script from the new package instead ...
/var/lib/dpkg/tmp.ci/prerm: 15: /var/lib/dpkg/tmp.ci/prerm: pyclean: not found
dpkg: error processing archive /var/cache/apt/archives/debconf_1.5.58ubuntu2_all.deb (--unpack):
 subprocess new pre-removal script returned error exit status 127
/var/lib/dpkg/info/debconf.postinst: 75: /var/lib/dpkg/info/debconf.postinst: pycompile: not found
dpkg: error while cleaning up:
 subprocess installed post-installation script returned error exit status 127
Errors were encountered while processing:
 /var/cache/apt/archives/debconf_1.5.58ubuntu2_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

Answer 1

問題のあるファイルを手動で編集すると/var/lib/dpkg/info/debconf.prermうまくいきました

この回答からhttps://askubuntu.com/a/979022/1025261