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[ubuntu]

apt installしてたら、こういうエラーが出て、

 libncurses5-dev : Depends: libtinfo5 (= 6.1-1ubuntu1) but 6.1-1ubuntu1.18.04 is to be installed
                   Depends: libncurses5 (= 6.1-1ubuntu1) but 6.1-1ubuntu1.18.04 is to be installed
                   Depends: libtinfo-dev (= 6.1-1ubuntu1) but it is not going to be installed
 

検索したら

• https://askubuntu.com/questions/1086630/ubuntu-18-04-broken-dependencies-when-preparing-to-install-rbenv

sudo apt install aptitude
sudo aptitude install autoconf bison build-essential libssl-dev libyaml-dev libreadline6-dev zlib1g-dev libncurses5-dev libffi-dev libgdbm5 libgdbm-dev

こういう解決策が出ていた。

aptitudeが、依存関係を解決してくれる！！！