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While trying to install Hadoop I created two users, one with the same name than the usual user. I want to get rid of it without deleting the one I'm usually using. Do you know how to do it ?

Here is the gedit /etc/passwd output :

root:x:0:0:root:/root:/bin/bash daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin bin:x:2:2:bin:/bin:/usr/sbin/nologin sys:x:3:3:sys:/dev:/usr/sbin/nologin sync:x:4:65534:sync:/bin:/bin/sync games:x:5:60:games:/usr/games:/usr/sbin/nologin man:x:6:12:man:/var/cache/man:/usr/sbin/nologin lp:x:7:7:lp:/var/spool/lpd:/usr/sbin/nologin mail:x:8:8:mail:/var/mail:/usr/sbin/nologin news:x:9:9:news:/var/spool/news:/usr/sbin/nologin uucp:x:10:10:uucp:/var/spool/uucp:/usr/sbin/nologin proxy:x:13:13:proxy:/bin:/usr/sbin/nologin www-data:x:33:33:www-data:/var/www:/usr/sbin/nologin backup:x:34:34:backup:/var/backups:/usr/sbin/nologin list:x:38:38:Mailing List Manager:/var/list:/usr/sbin/nologin irc:x:39:39:ircd:/var/run/ircd:/usr/sbin/nologin gnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/usr/sbin/nologin nobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologin systemd-timesync:x:100:102:systemd Time Synchronization,,,:/run/systemd:/bin/false systemd-network:x:101:103:systemd Network Management,,,:/run/systemd/netif:/bin/false systemd-resolve:x:102:104:systemd Resolver,,,:/run/systemd/resolve:/bin/false systemd-bus-proxy:x:103:105:systemd Bus Proxy,,,:/run/systemd:/bin/false syslog:x:104:108::/home/syslog:/bin/false _apt:x:105:65534::/nonexistent:/bin/false messagebus:x:106:110::/var/run/dbus:/bin/false uuidd:x:107:111::/run/uuidd:/bin/false lightdm:x:108:114:Light Display Manager:/var/lib/lightdm:/bin/false whoopsie:x:109:117::/nonexistent:/bin/false avahi-autoipd:x:110:119:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false avahi:x:111:120:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false dnsmasq:x:112:65534:dnsmasq,,,:/var/lib/misc:/bin/false colord:x:113:123:colord colour management daemon,,,:/var/lib/colord:/bin/false speech-dispatcher:x:114:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/false hplip:x:115:7:HPLIP system user,,,:/var/run/hplip:/bin/false kernoops:x:116:65534:Kernel Oops Tracking Daemon,,,:/:/bin/false pulse:x:117:124:PulseAudio daemon,,,:/var/run/pulse:/bin/false rtkit:x:118:126:RealtimeKit,,,:/proc:/bin/false saned:x:119:127::/var/lib/saned:/bin/false usbmux:x:120:46:usbmux daemon,,,:/var/lib/usbmux:/bin/false mike:x:1000:1000:mike,,,:/home/mike:/bin/bash mongodb:x:121:65534::/home/mongodb:/bin/false hadoop:x:1001:1001::/home/hadoop: sshd:x:122:65534::/var/run/sshd:/usr/sbin/nologin hduser:x:1002:1001:mike,A10,+33620050318,:/home/hduser:/bin/bash

I'm using ubuntu 16.04

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  • What tool let you create a duplicate username? Commented Nov 14, 2017 at 13:06
  • @IgnacioVazquez-Abrams sudo addgroup or sudo adduser. I don't remeber if it is from from this tutorial from michael-noll Commented Nov 14, 2017 at 13:08
  • "or"? As in you don't know which one? Commented Nov 14, 2017 at 13:09
  • @IgnacioVazquez-Abrams, Indeed, I noticed it while restarting my laptop Commented Nov 14, 2017 at 13:09
  • I don't think either of those commands will let you create a redundant/duplicate user. What makes you think you have two users with the same name? Commented Nov 14, 2017 at 13:22

1 Answer 1

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Look at the following two lines taken from your /etc/passwd file:

 mike:x:1000:1000:mike,,,:/home/mike:/bin/bash hduser:x:1002:1001:mike,A10,+33620050318,:/home/hduser:/bin/bash

You have two different users with different login names, but with the same "Full Name" of "mike". My guess is that your "duplicate" user is the one with login name "hduser".

For more information about the format of the /etc/passwd file you might refer to the following page from the Linux Documentation Project:

I would also assume that the "Full Name" (i.e. "mike") is what's being displayed by your GUI login screen. If so, then that's the user you should delete. You can do this from the command-line like so:

sudo userdel hduser

You could also do this via the Ubuntu GUI. For further discussion regarding user management in Ubuntu you may refer to the following post on AskUbuntu:

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