Lightdm/xfce graphical login fails probably after crash

cannot login to graphic UI anymore. Terminal (tty) login works. However in the terminal sudo is ignored completely. Login as root works too in terminal. Most obvious ouput of journalctl is “not a user managed by systemd-homed”, “no home for user”. Also, the line containing authentication/pam contains " hostname=? addr=?". So I suppose this is something related to user management. Since it all started after a low battery crash I suppose some sort of lockfile might still be in place? However the behaviour is the same for all users, even newly created ones.
inxi output:

Kernel: 5.10.167-1-MANJARO arch: x86_64 bits: 64 compiler: gcc v: 12.2.1
parameters: BOOT_IMAGE=/boot/vmlinuz-5.10-x86_64
root=UUID=9df8fa09-e260-4068-837f-fc0d958d434e rw quiet
Console: tty 4 DM: LightDM v: 1.32.0 Distro: Manjaro Linux base: Arch Linux
Type: Laptop System: LENOVO product: 20F5S2370M v: ThinkPad X260
serial: Chassis: type: 10 serial:
Mobo: LENOVO model: 20F5S2370M v: SDK0J40697 WIN serial:
UEFI: LENOVO v: R02ET70W (1.43 ) date: 01/28/2019
ID-1: BAT1 charge: 23.1 Wh (77.5%) condition: 29.8/56.2 Wh (53.0%)
volts: 11.5 min: 10.8 model: SMP 45N1736 type: Li-ion serial:
status: charging
RAM: total: 7.63 GiB used: 567.4 MiB (7.3%)
Array-1: capacity: 16 GiB slots: 1 EC: None max-module-size: 16 GiB
note: est.
Device-1: ChannelA-DIMM0 type: DDR4 detail: synchronous size: 8 GiB
speed: 2133 MT/s volts: curr: 1.2 width (bits): data: 64 total: 64
manufacturer: Samsung part-no: M471A1K43CB1-CRC serial:
Info: model: Intel Core i5-6300U socket: U3E1 bits: 64 type: MCP
arch: Skylake gen: core 6 level: v3 note: check built: 2015
process: Intel 14nm family: 6 model-id: 0x4E (78) stepping: 3
microcode: 0xF0
Topology: cpus: 1x cores: 2 smt: disabled cache: L1: 128 KiB
desc: d-2x32 KiB; i-2x32 KiB L2: 512 KiB desc: 2x256 KiB L3: 3 MiB
desc: 1x3 MiB
Speed (MHz): avg: 500 min/max: 400/3000 base/boost: 2400/8300 scaling:
driver: intel_pstate governor: powersave volts: 1.0 V ext-clock: 100 MHz
cores: 1: 500 2: 500 bogomips: 10002
Flags: 3dnowprefetch abm acpi adx aes aperfmperf apic arat
arch_capabilities arch_perfmon art avx avx2 bmi1 bmi2 bts clflush
clflushopt cmov constant_tsc cpuid cpuid_fault cx16 cx8 de ds_cpl dtes64
dtherm dts epb erms est f16c flush_l1d fma fpu fsgsbase fxsr hle ht hwp
hwp_act_window hwp_epp hwp_notify ibpb ibrs ida intel_pt invpcid
invpcid_single lahf_lm lm mca mce md_clear mmx monitor movbe mpx msr mtrr
nonstop_tsc nopl nx pae pat pbe pcid pclmulqdq pdcm pdpe1gb pebs pge pln
pni popcnt pse pse36 pti pts rdrand rdseed rdtscp rep_good rtm sdbg sep
smap smep smx ss ssbd sse sse2 sse4_1 sse4_2 ssse3 stibp syscall tm tm2
tsc tsc_adjust tsc_deadline_timer vme x2apic xgetbv1 xsave xsavec xsaveopt
xsaves xtopology xtpr
Type: itlb_multihit status: KVM: VMX unsupported
Type: l1tf mitigation: PTE Inversion
Type: mds mitigation: Clear CPU buffers; SMT disabled
Type: meltdown mitigation: PTI
Type: mmio_stale_data mitigation: Clear CPU buffers; SMT disabled
Type: retbleed mitigation: IBRS
Type: spec_store_bypass mitigation: Speculative Store Bypass disabled via
prctl and seccomp
Type: spectre_v1 mitigation: usercopy/swapgs barriers and __user pointer
Type: spectre_v2 mitigation: IBRS, IBPB: conditional, RSB filling,
PBRSB-eIBRS: Not affected
Type: srbds mitigation: Microcode
Type: tsx_async_abort mitigation: Clear CPU buffers; SMT disabled
Device-1: Intel Skylake GT2 [HD Graphics 520] vendor: Lenovo driver: i915
v: kernel arch: Gen-9 process: Intel 14n built: 2015-16 ports: active: eDP-1
empty: DP-1, DP-2, HDMI-A-1, HDMI-A-2 bus-ID: 00:02.0 chip-ID: 8086:1916
class-ID: 0300
Device-2: Acer ThinkPad P50 Integrated Camera type: USB driver: uvcvideo
bus-ID: 1-8:3 chip-ID: 5986:0706 class-ID: 0e02
Display: x11 server: v: driver: X: loaded: modesetting
alternate: fbdev,vesa dri: iris gpu: i915 tty: 240x67
Monitor-1: eDP-1 model: LG Display 0x0437 built: 2013 res: 1920x1080
dpi: 177 gamma: 1.2 size: 276x156mm (10.87x6.14") diag: 317mm (12.5")
ratio: 16:9 modes: 1920x1080
API: OpenGL Message: GL data unavailable in console and glxinfo missing.
Device-1: Intel Sunrise Point-LP HD Audio vendor: Lenovo
driver: snd_hda_intel v: kernel alternate: snd_soc_skl bus-ID: 00:1f.3
chip-ID: 8086:9d70 class-ID: 0403
Sound API: ALSA v: k5.10.167-1-MANJARO running: yes
Sound Server-1: JACK v: 1.9.22 running: no
Sound Server-2: PulseAudio v: 16.1 running: no
Sound Server-3: PipeWire v: 0.3.65 running: no
Device-1: Intel Ethernet I219-LM vendor: Lenovo driver: e1000e v: kernel
port: N/A bus-ID: 00:1f.6 chip-ID: 8086:156f class-ID: 0200
IF: enp0s31f6 state: down mac:
Device-2: Intel Wireless 8260 driver: iwlwifi v: kernel pcie: gen: 1
speed: 2.5 GT/s lanes: 1 bus-ID: 04:00.0 chip-ID: 8086:24f3 class-ID: 0280
IF: wlp4s0 state: down mac:
WAN IP: No WAN IP found. Connected to web? SSL issues? Try enabling dig
Device-1: Intel Bluetooth wireless interface type: USB driver: btusb v: 0.8
bus-ID: 1-7:2 chip-ID: 8087:0a2b class-ID: e001
Report: rfkill ID: hci0 rfk-id: 2 state: up address: see --recommends
Message: No logical block device data found.
Message: No RAID data found.
Local Storage: total: 484.46 GiB used: 120.55 GiB (24.9%)
SMART Message: Required tool smartctl not installed. Check --recommends
ID-1: /dev/sda maj-min: 8:0 vendor: Etelcom model: SSD0512S00
size: 476.94 GiB block-size: physical: 512 B logical: 512 B speed: 6.0 Gb/s
type: SSD serial: rev: 9A0 scheme: GPT
ID-2: /dev/sdb maj-min: 8:16 type: USB vendor: Generic model: Flash Disk
size: 7.52 GiB block-size: physical: 512 B logical: 512 B type: SSD
serial: rev: 8.07 scheme: MBR
Message: No optical or floppy data found.
ID-1: / raw-size: 70 GiB size: 68.35 GiB (97.64%) used: 24.38 GiB (35.7%)
fs: ext4 block-size: 4096 B dev: /dev/sda3 maj-min: 8:3 label: N/A
uuid: 9df8fa09-e260-4068-837f-fc0d958d434e
ID-2: /boot/efi raw-size: 150 MiB size: 147.7 MiB (98.45%)
used: 298 KiB (0.2%) fs: vfat block-size: 512 B dev: /dev/sda2 maj-min: 8:2
label: N/A uuid: 2101-59BE
ID-3: /home raw-size: 385 GiB size: 377.89 GiB (98.15%)
used: 96.17 GiB (25.5%) fs: ext4 block-size: 4096 B dev: /dev/sda4
maj-min: 8:4 label: N/A uuid: fac56d5f-fb28-4b43-a4f0-28b39b134263
ID-4: /mnt raw-size: 4 MiB size: 4 MiB (99.41%) used: 164 KiB (4.0%)
fs: vfat block-size: 512 B dev: /dev/sdb2 maj-min: 8:18 label: MISO_EFI
uuid: B811-4A5B
Kernel: swappiness: 60 (default) cache-pressure: 100 (default)
ID-1: swap-1 type: partition size: 21.78 GiB used: 0 KiB (0.0%)
priority: -2 dev: /dev/sda5 maj-min: 8:5 label: N/A
uuid: 4211354d-195a-405b-96e6-058fed45d497
ID-1: /dev/sda1 maj-min: 8:1 size: 8 MiB fs: N/A label: N/A uuid: N/A
ID-2: /dev/sdb1 maj-min: 8:17 size: 2.46 GiB fs: iso9660
Hub-1: 1-0:1 info: Hi-speed hub with single TT ports: 12 rev: 2.0
speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900
Device-1: 1-1:6 info: Alcor Micro Flash Drive type: Mass Storage
driver: usb-storage interfaces: 1 rev: 2.0 speed: 480 Mb/s power: 200mA
chip-ID: 058f:6387 class-ID: 0806 serial:
Device-2: 1-7:2 info: Intel Bluetooth wireless interface type: Bluetooth
driver: btusb interfaces: 2 rev: 2.0 speed: 12 Mb/s power: 100mA
chip-ID: 8087:0a2b class-ID: e001
Device-3: 1-8:3 info: Acer ThinkPad P50 Integrated Camera type: Video
driver: uvcvideo interfaces: 2 rev: 2.0 speed: 480 Mb/s power: 500mA
chip-ID: 5986:0706 class-ID: 0e02
Device-4: 1-9:4 info: Validity Sensors VFS 5011 fingerprint sensor
type: driver: N/A interfaces: 1 rev: 1.1 speed: 12 Mb/s
power: 100mA chip-ID: 138a:0017 class-ID: ff00 serial:
Hub-2: 2-0:1 info: Super-speed hub ports: 6 rev: 3.0 speed: 5 Gb/s
chip-ID: 1d6b:0003 class-ID: 0900
System Temperatures: cpu: 39.0 C pch: 39.5 C mobo: N/A
Fan Speeds (RPM): cpu: 0
Processes: 131 Uptime: 13m wakeups: 17 Init: systemd v: 252
default: graphical tool: systemctl Compilers: gcc: 12.2.1 clang: 15.0.7
Packages: pm: pacman pkgs: 1262 libs: 365 tools: pamac,yay
Shell: Bash (login) v: 5.1.16 running-in: tty 4 inxi: 3.3.25

If that follows an update, possible solution here :

unfortunately not a solution here. problem came after sudden low battery power off. libxfce4ui is in place

FWIW I found lightdm to be extremely stupid with mismatching gcc-libs.