COSMIC Store - flatpak installs fail for some apps

[bitshifter52]

Using the COSMIC Store (CS) I installed XnSketch. CS says it's installed but when I try to run it nothing happens.

Here is what I've discovered - from the terminal:

flatpak info com.xnview.XnSketch

XnSketch - Turn photos into sketch images

       ID: com.xnview.XnSketch
       Ref: app/com.xnview.XnSketch/x86_64/stable
       Arch: x86_64
       Branch: stable
       Version: 1.18
       License: LicenseRef-proprietary
       Origin: flathub
       Collection: org.flathub.Stable
       Installation: user
       Installed: 91.6 MB
       Runtime: org.freedesktop.Platform/x86_64/25.08
       Sdk: org.freedesktop.Sdk/x86_64/25.08

  Commit: ed40028c9a3c3f778521d82cc6ec0ca0e5007ab232c7c94a65ae522a7d9350ed
  Parent: 9d671894fd40d2701fea01a5b4ed1ada3fff38cf38aebaa0f61f302b1f76dbf2
  Subject: ImageMagick: Update 7.1.2-10.tar.gz to 7.1.2-11 (429c7c718f50)
  Date: 2025-12-16 01:06:29 +0000

Then I tried running XnSketch from within the terminal using flatpak and it failed with this error:

flatpak run com.xnview.XnSketch
This application failed to start because it could not find or load the Qt platform plugin "wayland;xcb".

Available platform plugins are: linuxfb, minimal, offscreen, xcb.

Reinstalling the application may fix this problem.
/app/bin/xnsketch: line 5: 5 Aborted (core dumped) "$dirname"/XnSketch "$@"

I tried uninstalling XnSketch from the terminal:

flatpak uninstall xnsketch
Found installed ref ‘app/com.xnview.XnSketch/x86_64/stable’ (user). Is this correct? [Y/n]: Y

    ID                                 Branch        Op

1. [-] com.xnview.XnSketch stable r
2. [-] com.xnview.XnSketch.Locale stable r

Uninstall complete.

Then I installed XnSketch from the command line:

flatpak install xnsketch
Looking for matches…
Found ref ‘app/com.xnview.XnSketch/x86_64/stable’ in remote ‘flathub’ (user).
Use this ref? [Y/n]: Y

com.xnview.XnSketch permissions:
ipc x11 dri file access [1] tags [2]

[1] xdg-pictures
[2] proprietary

Current flatpak installation:

flatpak list
Name Application ID Version Branch Installation
Dippi com.github.cassidyjames.dippi 4.1.1 stable user
XnSketch com.xnview.XnSketch 1.18 stable user
XnView MP com.xnview.XnViewMP 1.9.8 stable user
Examine io.github.cosmic_utils.Examine 1.0.0 stable user
PySolFC io.sourceforge.pysolfc.PySolFC 3.4.0 stable user
Epson Scan 2 net.epson.epsonscan2 6.7.82.0 stable user
Freedesktop Platform org.freedesktop.Platform freedesktop-sdk-24.08.28 24.08 user
Freedesktop Platform org.freedesktop.Platform freedesktop-sdk-25.08.6 25.08 user
Mesa org.freedesktop.Platform.GL.default 25.2.6 24.08 user
Mesa (Extra) org.freedesktop.Platform.GL.default 25.2.6 24.08extra user
Mesa org.freedesktop.Platform.GL.default 25.2.6 25.08 user
Mesa (Extra) org.freedesktop.Platform.GL.default 25.2.6 25.08-extra user
nvidia-580-82-09 …desktop.Platform.GL.nvidia-580-82-09 1.4 user
Nvidia VAAPI driver org.freedesktop.Platform.VAAPI.nvidia 25.08 user
Codecs Extra Extension org.freedesktop.Platform.codecs-extra 25.08-extra user
openh264 org.freedesktop.Platform.openh264 2.5.1 2.5.1 user
Aisleriot Solitaire org.gnome.Aisleriot 3.22.35 stable user
GNOME Application Platform … org.gnome.Platform 48 user
GNOME Application Platform … org.gnome.Platform 49 user
Pop Gtk theme org.gtk.Gtk3theme.Pop-dark 3.22 user
adw-gtk3 GTK Theme org.gtk.Gtk3theme.adw-gtk3-dark 6.4 3.22 user
Adwaita theme org.kde.KStyle.Adwaita 5.15-25.08 user
KDE Application Platform org.kde.Platform 5.15-25.08 user
KDE Application Platform org.kde.Platform 6.10 user
KSudoku org.kde.ksudoku 1.4.25120 stable user
Telegram org.telegram.desktop 6.3.9 stable user

Tried running it again and had the same results:

flatpak run com.xnview.XnSketch
This application failed to start because it could not find or load the Qt platform plugin "wayland;xcb".

Available platform plugins are: linuxfb, minimal, offscreen, xcb.

Reinstalling the application may fix this problem.
/app/bin/xnsketch: line 5: 5 Aborted (core dumped) "$dirname"/XnSketch "$@"

My system information:

inxi -Fxz System: Kernel: 6.17.9-76061709-generic arch: x86_64 bits: 64 compiler: gcc v: 13.3.0 Desktop: N/A Distro: Pop!_OS 24.04 base: Ubuntu 24.04 LTS Noble Machine: Type: Desktop System: Gigabyte product: X570 AORUS ELITE WIFI v: -CF serial: <superuser required> Mobo: Gigabyte model: X570 AORUS ELITE WIFI serial: <superuser required> UEFI: American Megatrends LLC. v: F38f date: 09/20/2023 CPU: Info: 6-core model: AMD Ryzen 5 5600X bits: 64 type: MT MCP arch: Zen 3+ rev: 0 cache: L1: 384 KiB L2: 3 MiB L3: 32 MiB Speed (MHz): avg: 2984 high: 3695 min/max: 561/4654 boost: enabled cores: 1: 3568 2: 3599 3: 3600 4: 1738 5: 3598 6: 1738 7: 1738 8: 3598 9: 3598 10: 3600 11: 1738 12: 3695 bogomips: 88806 Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm Graphics: Device-1: NVIDIA AD106 [GeForce RTX 4060 Ti] vendor: ASUSTeK driver: nvidia v: 580.82.09 arch: Lovelace bus-ID: 08:00.0 Display: wayland server: X.Org v: 24.1.2 with: Xwayland v: 24.1.2 driver: X: loaded: nvidia unloaded: fbdev,modesetting,nouveau,vesa gpu: nvidia,nvidia-nvswitch resolution: 5120x2880~160Hz API: EGL v: 1.5 drivers: nvidia,swrast platforms: active: gbm,wayland,x11,surfaceless,device inactive: device-1 API: OpenGL v: 4.6.0 compat-v: 4.5 vendor: nvidia mesa v: 580.82.09 glx-v: 1.4 direct-render: yes renderer: NVIDIA GeForce RTX 4060 Ti/PCIe/SSE2 Audio: Device-1: NVIDIA vendor: ASUSTeK driver: snd_hda_intel v: kernel bus-ID: 08:00.1 Device-2: AMD Starship/Matisse HD Audio vendor: Gigabyte driver: snd_hda_intel v: kernel bus-ID: 0a:00.4 API: ALSA v: k6.17.9-76061709-generic status: kernel-api Server-1: PipeWire v: 1.4.2 status: active Network: Device-1: Intel Wi-Fi 5 Wireless-AC 9x6x [Thunder Peak] driver: iwlwifi v: kernel bus-ID: 03:00.0 IF: wlp3s0 state: down mac: <filter> Device-2: Intel I211 Gigabit Network vendor: Gigabyte driver: igb v: kernel port: f000 bus-ID: 04:00.0 IF: enp4s0 state: up speed: 1000 Mbps duplex: full mac: <filter> IF-ID-1: docker0 state: down mac: <filter> IF-ID-2: tun0 state: unknown speed: 10000 Mbps duplex: full mac: N/A Bluetooth: Device-1: Intel Wireless-AC 9260 Bluetooth Adapter driver: btusb v: 0.8 type: USB bus-ID: 3-5:2 Report: hciconfig ID: hci0 rfk-id: 0 state: up address: <filter> bt-v: 5.1 lmp-v: 10 Drives: Local Storage: total: 52.8 TiB used: 17.06 TiB (32.3%) ID-1: /dev/sda vendor: Samsung model: PSSD T9 size: 3.64 TiB type: USB ID-2: /dev/sdb vendor: Seagate model: BUP Portable size: 4.55 TiB type: USB ID-3: /dev/sdc vendor: Inland model: SATA SSD size: 1.86 TiB ID-4: /dev/sdd vendor: Samsung model: SSD 870 EVO 1TB size: 931.51 GiB ID-5: /dev/sde vendor: Western Digital model: WD160EDGZ-11B2DA0 size: 14.55 TiB type: USB ID-6: /dev/sdf vendor: Seagate model: ST8000NM0105 size: 7.28 TiB ID-7: /dev/sdg vendor: Seagate model: ST8000NM0105 size: 7.28 TiB ID-8: /dev/sdh vendor: Western Digital model: WD60EZAZ-00SF3B0 size: 5.46 TiB ID-9: /dev/sdi vendor: Seagate model: ST8000DM004-2CX188 size: 7.28 TiB Partition: ID-1: / size: 906.94 GiB used: 140.74 GiB (15.5%) fs: ext4 dev: /dev/dm-1 mapped: data-root ID-2: /boot/efi size: 1020 MiB used: 602.6 MiB (59.1%) fs: vfat dev: /dev/sdd1 Swap: ID-1: swap-1 type: partition size: 4 GiB used: 0 KiB (0.0%) dev: /dev/dm-2 mapped: cryptswap ID-2: swap-2 type: zram size: 16 GiB used: 0 KiB (0.0%) dev: /dev/zram0 Sensors: System Temperatures: cpu: 37.9 C mobo: 27.0 C Fan Speeds (rpm): N/A Info: Memory: total: 64 GiB note: est. available: 62.72 GiB used: 8.14 GiB (13.0%) Processes: 478 Uptime: 44m Init: systemd target: graphical (5) Packages: 2648 Compilers: gcc: 13.3.0 Shell: Bash v: 5.2.21 inxi: 3.3.34

Any help will be very appreciated. Thanks!