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Your steam installation in Flatpak should have a bin_steam.sh in /../com.valvesoftware.Steam/current/active/files/lib/steam. Also a bootstrap.....tar.xz file. The script unpacks the bootstrap file in a .local/share/Steam directory. The bin_steam.sh script tells you where it installs around line 95: function install_bootstrap() { STEAMDIR="$1" # Save the umask and set strong permissions omask="$(umask)" umask 0077 echo $"Setting up Steam content in $STEAMDIR" Towards the end of the script there is the function check_bootstrap(), which checks that the bootstrap was unpacked successfully. Basically you can manually unpack the bootstrap file in the right place: tar -xf bootstrap.tar.xz and remove the checks in the script and it should execute and run. Make sure that the partition that has the bootstrap etc ($STEAMDIR) is mounted with the exec permission in /etc/fstab ! That's it - voila, it should run now....