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I use rkhunter on all of my RPis, since some are used as dedicated servers, to try and ensure no rootkits or other malware are installed on them. When I did the check as usual today, I got the following error message one one of three Pis:

nat@PiVPN:~ $ sudo rkhunter -c
Invalid SCRIPTWHITELIST configuration option: Non-existent pathname: /usr/sbin/adduser

Concerned by this, I tried to run the adduser command, both with sudo and as the actual root user and got this error:

root@PiVPN:/home/nat# adduser foo
bash: adduser: command not found

Should I be concerned by this, and how am I able to re-install or find this command?

System Information:
Raspberry Pi 2 Model B Rev 1.1

OS Information:
Distributor ID: Raspbian
Description: Raspbian GNU/Linux 9.8 (stretch)
Release: 9.8
Codename: stretch

Many Thanks, Nathaniel

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2 Answers 2

Reset to default
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The Foundation's documentation make it sound that adduser should be present on a recent Raspbian:

Create a new user

You can create additional users on your Raspbian installation with the adduser command.

Enter sudo adduser bob and you'll be prompted for a password for the new user bob. Leave this blank if you don't want a password.

If it is missing for whatever reason (though I would wonder why that is) you can try to reinstall it:

sudo apt-get install adduser
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  • Thanks @Ghanima, I tried this already and it said that adduser was already the newest version so nothing was installed and the problem persisted. However after a reboot the issue was resolved. Not sure what the cause was but thanks for the help.
    – NathanielJS
    Commented Mar 17, 2019 at 21:15
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Sounds like your path was screwed up. Make sure /usr/sbin is in your path. I have it set in my root user's .bashrc

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