Unknown user offered by lightdm greeter.(SOLVED)

[GuiGuy]

My greeter offers several users but one of them does not work and the user manager
does not see it.
How can I remove it from the greeter?

Code: Select all

Snapshot created on: 20210803_1854
System:    Kernel: 4.19.0-21-amd64 x86_64 bits: 64 compiler: gcc v: 8.3.0 
           parameters: BOOT_IMAGE=/boot/vmlinuz-4.19.0-21-amd64 
           root=UUID=<filter> ro quiet splash 
           Desktop: Xfce 4.14.2 tk: Gtk 3.24.5 info: xfce4-panel wm: xfwm 4.14.0 vt: 7 
           dm: LightDM 1.26.0 Distro: MX-19.4_x64 patito feo May 31  2020 
           base: Debian GNU/Linux 10 (buster) 
Machine:   Type: Desktop System: LENOVO product: 90BX001HUK v: Lenovo E50-00 serial: <filter> 
           Chassis: type: 3 serial: <filter> 
           Mobo: LENOVO model: Aptio CRB v: 31900056 WIN serial: <filter> UEFI-[Legacy]: LENOVO 
           v: O07KT43AUS date: 08/13/2014 
CPU:       Info: Quad Core model: Intel Pentium J2900 bits: 64 type: MCP arch: Silvermont 
           family: 6 model-id: 37 (55) stepping: 8 microcode: 838 cache: L2: 1024 KiB 
           flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 19325 
           Speed: 1333 MHz min/max: 1333/2666 MHz Core speeds (MHz): 1: 1333 2: 1333 3: 1389 
           4: 1397 
           Vulnerabilities: Type: itlb_multihit status: Not affected 
           Type: l1tf status: Not affected 
           Type: mds mitigation: Clear CPU buffers; SMT disabled 
           Type: meltdown mitigation: PTI 
           Type: mmio_stale_data status: Not affected 
           Type: spec_store_bypass status: Not affected 
           Type: spectre_v1 mitigation: usercopy/swapgs barriers and __user pointer sanitization 
           Type: spectre_v2 
           mitigation: Retpolines, IBPB: conditional, IBRS_FW, STIBP: disabled, RSB filling 
           Type: srbds status: Not affected 
           Type: tsx_async_abort status: Not affected 
Graphics:  Device-1: Intel Atom Processor Z36xxx/Z37xxx Series Graphics & Display vendor: Lenovo 
           driver: i915 v: kernel bus-ID: 00:02.0 chip-ID: 8086:0f31 class-ID: 0300 
           Device-2: Logitech Quickcam 3000 For Business type: USB 
           driver: snd-usb-audio,uvcvideo bus-ID: 1-3.4:5 chip-ID: 046d:09a5 class-ID: 0102 
           serial: <filter> 
           Display: x11 server: X.Org 1.20.4 compositor: xfwm4 v: 4.14.0 driver: 
           loaded: modesetting unloaded: fbdev,vesa display-ID: :0.0 screens: 1 
           Screen-1: 0 s-res: 1920x1080 s-dpi: 96 s-size: 508x285mm (20.0x11.2") 
           s-diag: 582mm (22.9") 
           Monitor-1: VGA-1 res: 1920x1080 hz: 60 dpi: 96 size: 509x286mm (20.0x11.3") 
           diag: 584mm (23") 
           OpenGL: renderer: Mesa DRI Intel Bay Trail v: 4.2 Mesa 18.3.6 compat-v: 3.0 
           direct render: Yes 
Audio:     Device-1: Intel Atom Processor Z36xxx/Z37xxx Series High Definition Audio 
           vendor: Lenovo driver: snd_hda_intel v: kernel bus-ID: 00:1b.0 chip-ID: 8086:0f04 
           class-ID: 0403 
           Device-2: Logitech Quickcam 3000 For Business type: USB 
           driver: snd-usb-audio,uvcvideo bus-ID: 1-3.4:5 chip-ID: 046d:09a5 class-ID: 0102 
           serial: <filter> 
           Sound Server-1: ALSA v: k4.19.0-21-amd64 running: yes 
           Sound Server-2: PulseAudio v: 12.2 running: yes 
Network:   Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: Lenovo 
           driver: r8169 v: kernel port: e000 bus-ID: 02:00.0 chip-ID: 10ec:8168 class-ID: 0200 
           IF: eth0 state: down mac: <filter> 
           Device-2: Ralink MT7601U Wireless Adapter type: USB driver: mt7601u bus-ID: 1-3.3:4 
           chip-ID: 148f:7601 class-ID: 0000 serial: <filter> 
           IF: wlan0 state: up mac: <filter> 
Drives:    Local Storage: total: 931.51 GiB used: 36.2 GiB (3.9%) 
           SMART Message: Unable to run smartctl. Root privileges required. 
           ID-1: /dev/sda maj-min: 8:0 vendor: HP model: MB1000GCWCV size: 931.51 GiB 
           block-size: physical: 512 B logical: 512 B speed: 3.0 Gb/s type: HDD rpm: 7200 
           serial: <filter> rev: HPGD scheme: MBR 
Partition: ID-1: / raw-size: 123.43 GiB size: 120.94 GiB (97.98%) used: 36.2 GiB (29.9%) 
           fs: ext4 dev: /dev/sda4 maj-min: 8:4 
Swap:      Kernel: swappiness: 15 (default 60) cache-pressure: 100 (default) 
           ID-1: swap-1 type: partition size: 4 GiB used: 0 KiB (0.0%) priority: -2 
           dev: /dev/sda3 maj-min: 8:3 
Sensors:   System Temperatures: cpu: 42.0 C mobo: N/A 
           Fan Speeds (RPM): N/A 
Repos:     Packages: note: see --pkg apt: 2770 lib: 1483 flatpak: 0 
           No active apt repos in: /etc/apt/sources.list 
           Active apt repos in: /etc/apt/sources.list.d/debian-stable-updates.list 
           1: deb http://deb.debian.org/debian/ buster-updates main contrib non-free
           Active apt repos in: /etc/apt/sources.list.d/debian.list 
           1: deb http://deb.debian.org/debian/ buster main contrib non-free
           2: deb http://deb.debian.org/debian-security/ buster/updates main contrib non-free
           Active apt repos in: /etc/apt/sources.list.d/mx.list 
           1: deb https://ftp.nluug.nl/os/Linux/distr/mxlinux/mx/repo/ buster main non-free
           Active apt repos in: /etc/apt/sources.list.d/opera-stable.list 
           1: deb https://deb.opera.com/opera-stable/ stable non-free
           Active apt repos in: /etc/apt/sources.list.d/skype-stable.list 
           1: deb [arch=amd64] https://repo.skype.com/deb stable main
           No active apt repos in: /etc/apt/sources.list.d/various.list 
Info:      Processes: 199 Uptime: 11m wakeups: 1 Memory: 3.75 GiB used: 1.25 GiB (33.3%) 
           Init: SysVinit v: 2.93 runlevel: 5 default: 5 tool: systemctl Compilers: gcc: 8.3.0 
           alt: 8 Shell: quick-system-in default: Bash v: 5.0.3 running-in: quick-system-in 
           inxi: 3.3.06 

[Jerry3904]

Did you try removing the user with MX User Manager?

[GuiGuy]

Yes, but MX user manager does not know of it.
The manager does not offer to do anything at all with it.

[GuiGuy]

I wonder where lightdm gets it from.

[GuiGuy]

I have to go away now but will come back later today.

[Huckleberry Finn]

Does the id command show anything? With its name, like :

Code: Select all

id huck

Also does that user have a directory in /home/ ?

[GuiGuy]

Thanks, Huck,
It does not have a directory.
But

$ id nova
uid=64060(nova) gid=64060(nova) groups=64060(nova)

Looks like a clue?

[timkb4cq]

Are you using OpenStack services or a personal cloud? Those can depend on nova-compute which creates the nova user.

[Huckleberry Finn]

The id number is interesting.. Whatever, you can try

Code: Select all

sudo deluser nova

Also have a check:

Code: Select all

sudo visudo

If there are any remaining lines , something like:

Code: Select all

nova    ALL=(ALL:ALL) ALL

delete , save, close.


Edit: Probably it's due to something like Tim mentioned above (hence that interesting id number).

[Stuart_M]

Does user nova appear in /var/lib/AccountsService/users/nova?

If so, the "SystemAccount" value in the nova file should be "false" (all non-system accounts should have that value; root will be "true").