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Ubuntuでsuコマンドでrootユーザになれない

Ubuntu16.04でsuコマンドでrootユーザになろうとしたら以下のようなエラーが出た。

$ su
Password: 
su: Authentication failure

原因

Ubuntuのデフォルトでrootユーザのパスワードが設定されていないのが原因。

対策

rootユーザのパスワードを設定する

$ sudo su -
# passwd
Enter new UNIX password: 
Retype new UNIX password: 
passwd: password updated successfully

これでsuコマンドが使えるようになる。

$ su
Password: 
/home/xxx#
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50
Help us understand the problem. What are the problem?