Boinc : 8.0.2 : Boinc connection error : Invalid client RPC password. Try reinstalling BOINC.

Hello!
I have been trying to fix this error for some time, unfortunately without success.

I have also tried to write a password in this file but it does not seem to be recognized.

I am also a member of the Boinc group and that too without success.

What I encountered again and again was /var/lib/boinc-client/, this folder does not exist for me. I can't find a directory called boinc-client anywhere.
The file gui_rpc_auth.cfg is located in /var/lib/boinc.

I have also tried rebooting but it didn't work.

I'm slowly running out of ideas.

Who can tell me why Boinc only runs as a flatpak but not as a separate installation?

Many thanks in advance.

Yours sincerely, R.Lehmeier

Translated with DeepL.com (free version)

My System :

inxi -Fxxxz
System:
  Kernel: 6.13.8-arch1-1 arch: x86_64 bits: 64 compiler: gcc v: 14.2.1
    clocksource: tsc
  Desktop: KDE Plasma v: 6.3.3 tk: Qt v: N/A wm: kwin_wayland vt: 1 dm: SDDM
    Distro: Arch Linux
Machine:
  Type: Desktop Mobo: Gigabyte model: X670 AORUS ELITE AX v: x.x
    serial: <superuser required> uuid: <superuser required> UEFI: American
    Megatrends LLC. v: F33b date: 02/21/2025
CPU:
  Info: 12-core model: AMD Ryzen 9 7900X bits: 64 type: MT MCP smt: enabled
    arch: Zen 4 rev: 2 cache: L1: 768 KiB L2: 12 MiB L3: 64 MiB
  Speed (MHz): avg: 5370 min/max: 545/5733 boost: enabled cores: 1: 5370
    2: 5370 3: 5370 4: 5370 5: 5370 6: 5370 7: 5370 8: 5370 9: 5370 10: 5370
    11: 5370 12: 5370 13: 5370 14: 5370 15: 5370 16: 5370 17: 5370 18: 5370
    19: 5370 20: 5370 21: 5370 22: 5370 23: 5370 24: 5370 bogomips: 225599
  Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm
Graphics:
  Device-1: Advanced Micro Devices [AMD/ATI] Navi 31 [Radeon RX 7900 XT/7900
    XTX/7900 GRE/7900M] vendor: Sapphire PULSE driver: amdgpu v: kernel
    arch: RDNA-3 pcie: speed: 16 GT/s lanes: 16 ports: active: DP-1,DP-2
    empty: HDMI-A-1,HDMI-A-2,Writeback-1 bus-ID: 03:00.0 chip-ID: 1002:744c
    class-ID: 0300
  Device-2: Advanced Micro Devices [AMD/ATI] Raphael vendor: Gigabyte
    driver: amdgpu v: kernel arch: RDNA-2 pcie: speed: 16 GT/s lanes: 16 ports:
    active: none empty: DP-3, DP-4, DP-5, HDMI-A-3, Writeback-2
    bus-ID: 17:00.0 chip-ID: 1002:164e class-ID: 0300 temp: 59.0 C
  Device-3: SunplusIT Depstech webcam driver: snd-usb-audio,uvcvideo
    type: USB rev: 2.0 speed: 480 Mb/s lanes: 1 bus-ID: 3-5:2 chip-ID: 1bdf:5050
    class-ID: 0102 serial: <filter>
  Display: wayland server: X.org v: 1.21.1.16 with: Xwayland v: 24.1.6
    compositor: kwin_wayland driver: X: loaded: amdgpu
    unloaded: modesetting,radeon alternate: fbdev,vesa dri: radeonsi
    gpu: amdgpu d-rect: 7680x2160 display-ID: 0
  Monitor-1: DP-1 pos: right model: Samsung U32J59x serial: <filter> res:
    mode: 3840x2160 hz: 60 scale: 175% (1.75) to: 2194x1234 dpi: 140
    size: 697x392mm (27.44x15.43") diag: 800mm (31.5") modes: max: 3840x2160
    min: 720x400
  Monitor-2: DP-2 pos: primary,left model: Samsung U32J59x serial: <filter>
    res: mode: 3840x2160 hz: 60 scale: 175% (1.75) to: 2194x1234 dpi: 140
    size: 697x392mm (27.44x15.43") diag: 800mm (31.5") modes: max: 3840x2160
    min: 720x400
  API: EGL v: 1.5 hw: drv: amd radeonsi platforms: device: 0 drv: radeonsi
    device: 1 drv: radeonsi device: 2 drv: swrast gbm: drv: radeonsi
    surfaceless: drv: radeonsi wayland: drv: radeonsi x11: drv: radeonsi
  API: OpenGL v: 4.6 compat-v: 4.5 vendor: amd mesa v: 25.0.2-arch1.2
    glx-v: 1.4 direct-render: yes renderer: AMD Radeon RX 7900 XT (radeonsi
    navi31 LLVM 19.1.7 DRM 3.61 6.13.8-arch1-1) device-ID: 1002:744c
    display-ID: :1.0
  API: Vulkan v: 1.4.309 layers: 11 surfaces: xcb,xlib,wayland device: 0
    type: discrete-gpu driver: N/A device-ID: 1002:744c device: 1
    type: integrated-gpu driver: N/A device-ID: 1002:164e
  Info: Tools: api: clinfo, eglinfo, glxinfo, vulkaninfo de: kscreen-console,
    kscreen-doctor, xfce4-display-settings wl: wayland-info
    x11: xdpyinfo, xprop, xrandr
Audio:
  Device-1: Advanced Micro Devices [AMD/ATI] Navi 31 HDMI/DP Audio
    driver: snd_hda_intel v: kernel pcie: speed: 16 GT/s lanes: 16
    bus-ID: 03:00.1 chip-ID: 1002:ab30 class-ID: 0403
  Device-2: Advanced Micro Devices [AMD/ATI] Rembrandt Radeon High
    Definition Audio driver: snd_hda_intel v: kernel pcie: speed: 16 GT/s
    lanes: 16 bus-ID: 17:00.1 chip-ID: 1002:1640 class-ID: 0403
  Device-3: Advanced Micro Devices [AMD] Family 17h/19h/1ah HD Audio
    vendor: Gigabyte driver: snd_hda_intel v: kernel pcie: speed: 16 GT/s
    lanes: 16 bus-ID: 17:00.6 chip-ID: 1022:15e3 class-ID: 0403
  Device-4: SunplusIT Depstech webcam driver: snd-usb-audio,uvcvideo
    type: USB rev: 2.0 speed: 480 Mb/s lanes: 1 bus-ID: 3-5:2 chip-ID: 1bdf:5050
    class-ID: 0102 serial: <filter>
  Device-5: C-Media Audio Adapter (Unitek Y-247A)
    driver: cmedia_hs100b,snd-usb-audio,usbhid type: USB rev: 1.1 speed: 12 Mb/s
    lanes: 1 bus-ID: 9-1.4:6 chip-ID: 0d8c:0014 class-ID: 0300
  API: ALSA v: k6.13.8-arch1-1 status: kernel-api
  Server-1: sndiod v: N/A status: off
  Server-2: PipeWire v: 1.4.1 status: active with: 1: pipewire-pulse
    status: active 2: wireplumber status: active 3: pipewire-alsa type: plugin
    4: pw-jack type: plugin
Network:
  Device-1: Realtek RTL8125 2.5GbE vendor: Gigabyte driver: r8169 v: kernel
    pcie: speed: 5 GT/s lanes: 1 port: e000 bus-ID: 10:00.0 chip-ID: 10ec:8125
    class-ID: 0200
  IF: enp16s0 state: up speed: 1000 Mbps duplex: full mac: <filter>
  Device-2: MEDIATEK MT7922 802.11ax PCI Express Wireless Network Adapter
    driver: mt7921e v: kernel pcie: speed: 5 GT/s lanes: 1 bus-ID: 11:00.0
    chip-ID: 14c3:0616 class-ID: 0280
  IF: wlan0 state: down mac: <filter>
Bluetooth:
  Device-1: MediaTek Wireless_Device driver: btusb v: 0.8 type: USB rev: 2.1
    speed: 480 Mb/s lanes: 1 bus-ID: 3-7:4 chip-ID: 0e8d:0616 class-ID: e001
    serial: <filter>
  Report: btmgmt ID: hci0 rfk-id: 0 state: down bt-service: disabled
    rfk-block: hardware: no software: no address: N/A
Drives:
  Local Storage: total: 1.83 TiB used: 1.17 TiB (64.0%)
  ID-1: /dev/nvme0n1 vendor: Samsung model: SSD 990 PRO 2TB size: 1.82 TiB
    speed: 63.2 Gb/s lanes: 4 tech: SSD serial: <filter> fw-rev: 4B2QJXD7
    temp: 44.9 C scheme: GPT
  ID-2: /dev/sda vendor: Kingston model: DataTraveler SE9 size: 7.42 GiB
    type: USB rev: 2.0 spd: 480 Mb/s lanes: 1 tech: N/A serial: <filter>
    fw-rev: PMAP
Partition:
  ID-1: / size: 195.31 GiB used: 64.63 GiB (33.1%) fs: btrfs
    dev: /dev/nvme0n1p2
  ID-2: /boot/efi size: 2 GiB used: 584 KiB (0.0%) fs: vfat
    dev: /dev/nvme0n1p1
  ID-3: /home size: 1.63 TiB used: 1.11 TiB (68.0%) fs: btrfs
    dev: /dev/nvme0n1p3
  ID-4: /var/log size: 195.31 GiB used: 64.63 GiB (33.1%) fs: btrfs
    dev: /dev/nvme0n1p2
Swap:
  Alert: No swap data was found.
Sensors:
  System Temperatures: cpu: 90.8 C mobo: 42.0 C
  Fan Speeds (rpm): N/A
  GPU: device: amdgpu temp: 59.0 C device: amdgpu temp: 51.0 C mem: 60.0 C
    fan: 0 watts: 31.00
Info:
  Memory: total: 128 GiB note: est. available: 124.91 GiB
    used: 23.94 GiB (19.2%)
  Processes: 592 Power: uptime: 1h 28m states: freeze,mem,disk suspend: deep
    wakeups: 0 hibernate: platform Init: systemd v: 257 default: graphical
  Packages: 2521 pm: pacman pkgs: 2506 pm: flatpak pkgs: 15 Compilers:
    clang: 19.1.7 gcc: 14.2.1 Shell: Bash v: 5.2.37 running-in: yakuake