With "getent passwd | grep 1000" I get the same single entry as above.
This is a test system, not only there is no NIS and LDAP, but there is a single user right now. /etc/passwd as follows 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 syslog:x:101:102::/home/syslog:/bin/false messagebus:x:103:104::/var/run/dbus:/bin/false polkituser:x:104:105:PolicyKit,,,:/var/run/PolicyKit:/bin/false hplip:x:106:7:HPLIP system user,,,:/var/run/hplip:/bin/false avahi-autoipd:x:107:113:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false avahi:x:108:114:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false saned:x:109:117::/home/saned:/bin/false callegar:x:1000:1000:Sergio Callegari:/home/callegar:/bin/bash stunnel4:x:111:123::/var/run/stunnel4:/bin/false sshd:x:110:65534::/var/run/sshd:/usr/sbin/nologin pulse:x:112:119:PulseAudio daemon,,,:/var/run/pulse:/bin/false clamav:x:113:125::/var/lib/clamav:/bin/false postfix:x:102:103::/var/spool/postfix:/bin/false usbmux:x:114:46:usbmux daemon,,,:/home/usbmux:/bin/false rtkit:x:115:126:RealtimeKit,,,:/proc:/bin/false oprofile:x:116:127:OProfile JIT user,,,:/var/lib/oprofile:/bin/bash colord:x:105:106:colord colour management daemon,,,:/var/lib/colord:/bin/false dhcpd:x:118:135::/var/run:/bin/false timidity:x:119:136:TiMidity++ MIDI sequencer service:/etc/timidity:/bin/false dnsmasq:x:121:65534:dnsmasq,,,:/var/lib/misc:/bin/false whoopsie:x:122:128::/nonexistent:/bin/false dcmtk:x:117:139::/var/lib/dcmtk/db:/bin/sh uuidd:x:100:101::/run/uuidd:/bin/false gpsd:x:123:20:GPSD system user,,,:/run/gpsd:/bin/false systemd-timesync:x:124:142:systemd Time Synchronization,,,:/run/systemd:/bin/false systemd-network:x:125:143:systemd Network Management,,,:/run/systemd/netif:/bin/false systemd-resolve:x:126:144:systemd Resolver,,,:/run/systemd/resolve:/bin/false systemd-bus-proxy:x:127:145:systemd Bus Proxy,,,:/run/systemd:/bin/false kernoops:x:129:65534:Kernel Oops Tracking Daemon,,,:/:/bin/false speech-dispatcher:x:130:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/false sddm:x:120:137:Simple Desktop Display Manager:/var/lib/sddm:/bin/false Here is /etc/group root:x:0: daemon:x:1: bin:x:2: sys:x:3: adm:x:4:callegar,syslog tty:x:5: disk:x:6: lp:x:7:callegar mail:x:8: news:x:9: uucp:x:10: man:x:12: proxy:x:13: kmem:x:15: dialout:x:20:callegar fax:x:21:callegar voice:x:22: cdrom:x:24:callegar floppy:x:25:callegar tape:x:26: sudo:x:27:callegar audio:x:29:pulse,timidity dip:x:30: www-data:x:33: backup:x:34: operator:x:37: list:x:38: irc:x:39: src:x:40: gnats:x:41: shadow:x:42: utmp:x:43: video:x:44: sasl:x:45: plugdev:x:46:callegar staff:x:50:callegar games:x:60: users:x:100: nogroup:x:65534: syslog:x:102:callegar messagebus:x:104: polkituser:x:105: fuse:x:107:callegar ssl-cert:x:108: lpadmin:x:109:callegar crontab:x:110: mlocate:x:111: ssh:x:112: avahi-autoipd:x:113: avahi:x:114: netdev:x:115: admin:x:116:callegar saned:x:117: callegar:x:1000: sambashare:x:118:callegar winbindd_priv:x:122: stunnel4:x:123: vboxusers:x:124:callegar pulse:x:119: pulse-access:x:120: clamav:x:125: postfix:x:103: postdrop:x:121: rtkit:x:126: oprofile:x:127: utempter:x:129: bluetooth:x:131: powerdev:x:132: colord:x:106: scanner:x:133:colord,callegar,saned _cvsadmin:x:134: pcscd:x:130: dhcpd:x:135: timidity:x:136: nopasswdlogin:x:138: whoopsie:x:128: dcmtk:x:139: uuidd:x:101: systemd-journal:x:140: systemd-journal-remote:x:141: systemd-timesync:x:142: systemd-network:x:143: systemd-resolve:x:144: systemd-bus-proxy:x:145: input:x:146: sddm:x:137: -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to policykit-1 in Ubuntu. https://bugs.launchpad.net/bugs/1451815 Title: lists users multiple time when requiring user authentication Status in policykit-1 package in Ubuntu: Incomplete Bug description: To reproduce systemctl restart <some unit> ==== AUTHENTICATING FOR org.freedesktop.systemd1.manage-units === Authentication is required to manage system services or units. Multiple identities can be used for authentication: 1. Sergio Callegari (callegar) 2. Sergio Callegari (callegar) Choose identity to authenticate as (1-2): Why is the same identity seen as two different identities? ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: systemd 219-7ubuntu4 ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3 Uname: Linux 3.19.0-15-generic x86_64 NonfreeKernelModules: nvidia ApportVersion: 2.17.2-0ubuntu1 Architecture: amd64 CurrentDesktop: KDE Date: Tue May 5 14:50:15 2015 EcryptfsInUse: Yes MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M. ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-15-generic root=/dev/mapper/DISK00-root ro quiet splash nomodeset video=uvesafb:mode_option=1024x768-16,mtrr=3,scroll=ywrap nomdmonddf nomdmonisw vt.handoff=7 SourcePackage: systemd UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/21/2010 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: P2.10 dmi.board.name: N68-S dmi.board.vendor: ASRock dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: To Be Filled By O.E.M. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP2.10:bd04/21/2010:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnN68-S:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.: dmi.product.name: To Be Filled By O.E.M. dmi.product.version: To Be Filled By O.E.M. dmi.sys.vendor: To Be Filled By O.E.M. 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