That’s the question here :) Flatpak it self can’t be the issue because other Flatpaks work. My system can’t be the issue because my system works. And yes, the Steam Flatpak on it’s own also can’t be the issue because then more people would be affected and I would find something during web research.
How about the package manager version?
There isn’t really a Steam version in the repos but only in multilib. So I enabled it and installed steam from there. It also crashes. The only difference is that there are some fontconfig things it cannot understand.
<span style="color:#323232;">GetWin32Stats: display was not open yet, good
</span><span style="color:#323232;">GetWin32Stats: display was not open yet, good
</span><span style="color:#323232;">steamwebhelper.sh[19338]: Runtime for steamwebhelper: defaulting to /home/dirk/.local/share/Steam/ubuntu12_64/steam-runtime-heavy
</span><span style="color:#323232;">steamwebhelper.sh[19338]: glibc >= 2.34, partially disabling sandbox until CEF supports clone3()
</span><span style="color:#323232;">Fontconfig warning: line 5: unknown element "description"
</span><span style="color:#323232;">Fontconfig warning: "/etc/fonts/conf.d/10-hinting-slight.conf", line 4: unknown element "description"
</span><span style="color:#323232;">Fontconfig warning: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 4: unknown element "description"
</span><span style="color:#323232;">Fontconfig error: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 72: non-double matrix element
</span><span style="color:#323232;">Fontconfig error: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 72: non-double matrix element
</span><span style="color:#323232;">Fontconfig warning: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 80: saw unknown, expected number
</span><span style="color:#323232;">Fontconfig warning: "/etc/fonts/conf.d/10-sub-pixel-rgb.conf", line 4: unknown element "description"
</span><span style="color:#323232;">Fontconfig warning: "/etc/fonts/conf.d/10-yes-antialias.conf", line 4: unknown element "description"
</span><span style="color:#323232;">Fontconfig warning: "/etc/fonts/conf.d/11-lcdfilter-default.conf", line 4: unknown element "description"
</span><span style="color:#323232;">Fontconfig warning: "/etc/fonts/conf.d/20-unhint-small-vera.conf", line 4: unknown element "description"
</span><span style="color:#323232;">Fontconfig warning: "/etc/fonts/conf.d/30-metric-aliases.conf", line 4: unknown element "description"
</span><span style="color:#323232;">Fontconfig warning: "/etc/fonts/conf.d/40-nonlatin.conf", line 4: unknown element "description"
</span><span style="color:#323232;">Fontconfig warning: "/etc/fonts/conf.d/45-generic.conf", line 4: unknown element "description"
</span><span style="color:#323232;">Fontconfig warning: "/etc/fonts/conf.d/45-latin.conf", line 4: unknown element "description"
</span><span style="color:#323232;">Fontconfig warning: "/etc/fonts/conf.d/48-spacing.conf", line 4: unknown element "description"
</span><span style="color:#323232;">Fontconfig warning: "/etc/fonts/conf.d/49-sansserif.conf", line 4: unknown element "description"
</span><span style="color:#323232;">Fontconfig warning: "/etc/fonts/conf.d/50-user.conf", line 4: unknown element "description"
</span><span style="color:#323232;">Fontconfig warning: "/etc/fonts/conf.d/51-local.conf", line 4: unknown element "description"
</span><span style="color:#323232;">Fontconfig warning: "/etc/fonts/conf.d/60-generic.conf", line 4: unknown element "description"
</span><span style="color:#323232;">Fontconfig warning: "/etc/fonts/conf.d/60-latin.conf", line 4: unknown element "description"
</span><span style="color:#323232;">Fontconfig warning: "/etc/fonts/conf.d/65-nonlatin.conf", line 4: unknown element "description"
</span><span style="color:#323232;">CAppInfoCacheReadFromDiskThread took 0 milliseconds to initialize
</span><span style="color:#323232;">src/steamUI/steamuisharedjscontroller.cpp (540) : Failed creating offscreen shared JS context
</span><span style="color:#323232;">src/steamUI/steamuisharedjscontroller.cpp (540) : Fatal assert; application exiting
</span><span style="color:#323232;">08/19 01:26:26 Init: Installing breakpad exception handler for appid(steam)/version(1690583737)/tid(19319)
</span><span style="color:#323232;">assert_20230819012626_30.dmp[19438]: Uploading dump (out-of-process)
</span><span style="color:#323232;">/tmp/dumps/assert_20230819012626_30.dmp
</span><span style="color:#323232;">dirk ~ $
</span><span style="color:#323232;">assert_20230819012626_30.dmp[19438]: Finished uploading minidump (out-of-process): success = yes
</span><span style="color:#323232;">assert_20230819012626_30.dmp[19438]: response: CrashID=bp-175add07-33af-421a-a870-828612230818
</span><span style="color:#323232;">assert_20230819012626_30.dmp[19438]: file ''/tmp/dumps/assert_20230819012626_30.dmp'', upload yes: ''CrashID=bp-175add07-33af-421a-a870-828612230818''
</span>
So it’s Steam in combination with my system. This time the mentioned dump is there but it does not contain any information I could use/understand.
This is what all the people who had to remove xdg Desktop portal use. How could they remove it if it’s a dependency of flatpak?
When reinstalling Flatpak it asked for xdg-desktop-portal-impl to be installed and offered multiple packages that provide it.
It also worked earlier during testing (at least one time it started up and let me log in but subsequently it crashed on any of the further tries) so all dependencies are satisfied.