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1. Set root password and use SU commandIn the default configuration of Ubuntu, the root user is unavailable because no password has been set.By setting a password for the root user, transitions using the traditional [su] command will be possible.3. Make locate command availableThe find command is often used to search for specific files throughout the Linux system, but find is somewhat confusing in terms of specifying options.The locate command can extract all files with a specified filename.4. vim editor settingsUbuntu has vim installed by default4.1 Change vim settingsThere may be cases where you do not want to allow vim settings for all users. In such cases, a ".vimrc" file can be created in each user's home directory to change the vim environment for each user.In this case, we will create a ".vimrc" file in the root user's home directory "/root/" and apply it to all users.