i tried to launch flatpak steam but its not launching/opening Cachyos

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FLATPAK_SANDBOX_DIR=~/ flatpak run com.valvesoftware.Steam -no-cef-sandbox -cef-disable-gpu ⌂ 20:03
INFO:root: [Home · flathub/com.valvesoftware.Steam Wiki · GitHub](https://github.com/flathub/com.valvesoftware.Steam/wiki)
INFO:root:Will set XDG dirs prefix to /home/bolorshagai/.var/app/com.valvesoftware.Steam
DEBUG:root:Checking input devices permissions
INFO:root:Overriding TZ to Asia/Ulaanbaatar
srt-logger[12]: E: Unable to open “console-linux.txt”: Read-only file system
bin_steam.sh[2]: Couldn’t set up srt-logger, not logging to console-linux.txt
srt-logger[19]: E: Unable to open “console-linux.txt”: Read-only file system
bin_steam.sh[2]: Couldn’t set up srt-logger, not logging to console-linux.txt
srt-logger[25]: E: Unable to open “console-linux.txt”: Read-only file system
bin_steam.sh[2]: Couldn’t set up srt-logger, not logging to console-linux.txt
steam.sh[2]: Running Steam on org.freedesktop.platform 25.08 64-bit
steam.sh[2]: STEAM_RUNTIME is enabled automatically
setup.sh[63]: Steam runtime environment up-to-date!
steam.sh[2]: Log already open
steam.sh[2]: Steam client’s requirements are satisfied
CProcessEnvironmentManager is ready, 5 preallocated environment variables.
08/12 20:03:36 minidumps folder is set to /tmp/dumps
08/12 20:03:36 Init: Installing breakpad exception handler for appid(steam)/version(1785799196)/tid(106)
CProcessEnvironmentManager is ready, 5 preallocated environment variables.
[2026-08-12 20:03:36] Process started with command-line: ‘/home/bolorshagai/.var/app/com.valvesoftware.Steam/.local/share/Steam/ubuntu12_32/steam’ ‘-child-update-ui’ ‘-child-update-ui-socket’ ‘7’ ‘-srt-logger-opened’ ‘-no-cef-sandbox’ ‘-no-cef-sandbox’ ‘-cef-disable-gpu’
08/12 20:03:36 minidumps folder is set to /tmp/dumps
[2026-08-12 20:03:36] Using update UI: console
08/12 20:03:36 minidumps folder is set to /tmp/dumps
08/12 20:03:36 Init: Installing breakpad exception handler for appid(steam)/version(0)/tid(107)
[2026-08-12 20:03:36] Create window
[2026-08-12 20:03:36] Set percent complete: 0
[2026-08-12 20:03:36] Set percent complete: -1
[2026-08-12 20:03:36] Set status message: Verifying installation…
[----] Verifying installation…
UpdateUI: skip show logo
[2026-08-12 20:03:36] Destroy window

Steam logging initialized: directory: /home/bolorshagai/.var/app/com.valvesoftware.Steam/.local/share/Steam/logs

[2026-08-12 20:03:36] ProcessNextMessage: socket disconnected
[2026-08-12 20:03:36] No more messages are expected - exiting
XOpenIM() failed, LANG = en_US.UTF-8
XOpenIM() failed, LANG = en_US.UTF-8XRRGetOutputInfo Workaround: initialized with override: 0 real: 0xf63977b0
XRRGetCrtcInfo Workaround: initialized with override: 0 real: 0xf6396020
08/12 20:03:36 minidumps folder is set to /tmp/dumps
08/12 20:03:36 Init: Installing breakpad exception handler for appid(steamsysinfo)/version(1785799196)/tid(129)
Running query: 1 - GpuTopology
WARNING: radv is not a conformant Vulkan implementation, testing use only.
Response: gpu_topology {
gpus {
id: 1
name: “AMD Radeon RX 9060 XT (RADV GFX1200)”
vram_size_bytes: 8539602944
driver_id: k_EGpuDriverId_MesaRadv
driver_version_major: 26
driver_version_minor: 1
driver_version_patch: 5
luid: 0
}
gpus {
id: 2
name: “AMD Ryzen 7 7800X3D 8-Core Processor (RADV RAPHAEL_MENDOCINO)”
vram_size_bytes: 5620678656
driver_id: k_EGpuDriverId_MesaRadv
driver_version_major: 26
driver_version_minor: 1
driver_version_patch: 5
luid: 0
}
gpus {
id: 3
name: “llvmpipe (LLVM 21.1.8, 256 bits)”
vram_size_bytes: 3221225472
driver_id: k_EGpuDriverId_MesaLLVMPipe
driver_version_major: 26
driver_version_minor: 1
driver_version_patch: 5
luid: 0
}
default_gpu_id: 1
}

Exit code: 0
Saving response to: /tmp/steamGojacc - 200 bytes
srt-logger[162]: E: Unable to open “webhelper-linux.txt”: Read-only file system
steamwebhelper.sh[148]: Couldn’t set up logger, continuing to use inherited fd
steamwebhelper.sh[148]: Starting steamwebhelper under bootstrap steamrt steam runtime via: /home/bolorshagai/.var/app/com.valvesoftware.Steam/.local/share/Steam/steamrt64/pv-runtime/steam-runtime-steamrt/_v2-entry-point
steamwebhelper.sh[148]: CEF sandbox already disabled
steamwebhelper.sh[148]: Starting steamwebhelper with steamrt steam runtime at /home/bolorshagai/.var/app/com.valvesoftware.Steam/.local/share/Steam/steamrt64/pv-runtime/steam-runtime-steamrt/_v2-entry-point
pressure-vessel-wrap[148]: E: openat(/home/bolorshagai/.var/app/com.valvesoftware.Steam/.local/share/Steam/steamrt64/pv-runtime/steam-runtime-steamrt/steamrt3c_platform_3c.0.20260618.246540/files/.ref): Read-only file system
Failed to create /home/bolorshagai/.var/app/com.valvesoftware.Steam/.local/share/Steam/shader_cache_temp_dir_gl_64 for shader cache (Read-only file system)—disabling.
Steam Runtime Launch Service: starting steam-runtime-launcher-service
Steam Runtime Launch Service: steam-runtime-launcher-service is running pid 263
bus_name=com.steampowered.PressureVessel.LaunchAlongsideSteam
Failed to create /home/bolorshagai/.var/app/com.valvesoftware.Steam/.local/share/Steam/shader_cache_temp_dir_gl_32 for shader cache (Read-only file system)—disabling.
Failed to create /home/bolorshagai/.var/app/com.valvesoftware.Steam/.local/share/Steam/shader_cache_temp_dir_vk_64 for shader cache (Read-only file system)—disabling.
Failed to create /home/bolorshagai/.var/app/com.valvesoftware.Steam/.local/share/Steam/shader_cache_temp_dir_vk_64 for shader cache (Read-only file system)—disabling.
WARNING: radv is not a conformant Vulkan implementation, testing use only.
Failed to create /home/bolorshagai/.var/app/com.valvesoftware.Steam/.local/share/Steam/shader_cache_temp_dir_vk_64 for shader cache (Read-only file system)—disabling.
Failed to create /home/bolorshagai/.var/app/com.valvesoftware.Steam/.local/share/Steam/shader_cache_temp_dir_vk_64 for shader cache (Read-only file system)—disabling.
Failed to create /home/bolorshagai/.var/app/com.valvesoftware.Steam/.local/share/Steam/shader_cache_temp_dir_vk_64 for shader cache (Read-only file system)—disabling.
Failed to create /home/bolorshagai/.var/app/com.valvesoftware.Steam/.local/share/Steam/shader_cache_temp_dir_vk_64 for shader cache (Read-only file system)—disabling.
WARNING: radv is not a conformant Vulkan implementation, testing use only.
Failed to create /home/bolorshagai/.var/app/com.valvesoftware.Steam/.local/share/Steam/shader_cache_temp_dir_vk_64 for shader cache (Read-only file system)—disabling.
Failed to create /home/bolorshagai/.var/app/com.valvesoftware.Steam/.local/share/Steam/shader_cache_temp_dir_vk_64 for shader cache (Read-only file system)—disabling.
Failed to create /home/bolorshagai/.var/app/com.valvesoftware.Steam/.local/share/Steam/shader_cache_temp_dir_vk_32 for shader cache (Read-only file system)—disabling.
Failed to create /home/bolorshagai/.var/app/com.valvesoftware.Steam/.local/share/Steam/shader_cache_temp_dir_vk_32 for shader cache (Read-only file system)—disabling.
WARNING: radv is not a conformant Vulkan implementation, testing use only.
Failed to create /home/bolorshagai/.var/app/com.valvesoftware.Steam/.local/share/Steam/shader_cache_temp_dir_vk_32 for shader cache (Read-only file system)—disabling.
Failed to create /home/bolorshagai/.var/app/com.valvesoftware.Steam/.local/share/Steam/shader_cache_temp_dir_vk_32 for shader cache (Read-only file system)—disabling.
srt-logger[307]: E: Unable to open “webhelper-linux.txt”: Read-only file system
steamwebhelper.sh[301]: Couldn’t set up logger, continuing to use inherited fd
steamwebhelper.sh[301]: Starting steamwebhelper under bootstrap steamrt steam runtime via: /home/bolorshagai/.var/app/com.valvesoftware.Steam/.local/share/Steam/steamrt64/pv-runtime/steam-runtime-steamrt/_v2-entry-point
steamwebhelper.sh[301]: CEF sandbox already disabled
steamwebhelper.sh[301]: Starting steamwebhelper with steamrt steam runtime at /home/bolorshagai/.var/app/com.valvesoftware.Steam/.local/share/Steam/steamrt64/pv-runtime/steam-runtime-steamrt/_v2-entry-point
pressure-vessel-wrap[301]: E: openat(/home/bolorshagai/.var/app/com.valvesoftware.Steam/.local/share/Steam/steamrt64/pv-runtime/steam-runtime-steamrt/steamrt3c_platform_3c.0.20260618.246540/files/.ref): Read-only file system
srt-logger[338]: E: Unable to open “webhelper-linux.txt”: Read-only file system
steamwebhelper.sh[332]: Couldn’t set up logger, continuing to use inherited fd
steamwebhelper.sh[332]: Starting steamwebhelper under bootstrap steamrt steam runtime via: /home/bolorshagai/.var/app/com.valvesoftware.Steam/.local/share/Steam/steamrt64/pv-runtime/steam-runtime-steamrt/_v2-entry-point
steamwebhelper.sh[332]: CEF sandbox already disabled
steamwebhelper.sh[332]: Starting steamwebhelper with steamrt steam runtime at /home/bolorshagai/.var/app/com.valvesoftware.Steam/.local/share/Steam/steamrt64/pv-runtime/steam-runtime-steamrt/_v2-entry-point
pressure-vessel-wrap[332]: E: openat(/home/bolorshagai/.var/app/com.valvesoftware.Steam/.local/share/Steam/steamrt64/pv-runtime/steam-runtime-steamrt/steamrt3c_platform_3c.0.20260618.246540/files/.ref): Read-only file system

Start by reproducing the reported `flatpak run com.valvesoftware.Steam -no-cef-sandbox -cef-disable-gpu` command on CachyOS and inspect the attached launch output, especially the read-only filesystem errors. No repository file, test, or entry point is named; done would require identifying a reproducible cause and confirming that Steam launches successfully after the relevant fix or configuration change.

Written by the indexing model from the issue text.