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flatpak, Steam and non-privileged namespaces



Current up-to-date installation of Funtoo (1.3), trying to have Steam installed via flatpak.

The installation of flatpak was successful, then I added the Steam flatpak repo. Now trying to run Steam with flatpak.

As regular user, the output of "flatpak run com.valvesoftware.Steam" is

	bwrap: No permissions to creating new namespace, likely because the kernel does not allow non-privileged user namespaces. On e.g. debian this can be enabled with 'sysctl kernel.unprivileged_userns_clone=1'.
error: ldconfig failed, exit status 256

I looked around and the only mention of a similar problem was


The solution there was to run as root. However trying to run the above as root fails because Steam cannot run as root.


All help appreciated.

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15 hours ago, cardinal said:

Default setting is disabled:

# cat /proc/sys/kernel/unprivileged_userns_clone 

Enable on reboot:

# echo 'kernel.unprivileged_userns_clone=1' > /etc/sysctl.d/unprivileged_userns_clone.conf

Verify enabled:

# cat  /proc/sys/kernel/unprivileged_userns_clone 

Thank you, that worked. Steam started after reboot, updating now.

(edit) Yes it works fine.

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You will only see


if you are booted into debian-sources or debian-sources-lts kernel.

I use  vanilla kernel sources, had to enable CONFIG_{USER_NS, UTS_NS, IPC_NS, PID_NS} and recompile.

Flatpak has pulseaudio error and I have no sound with any flatpak programs.


I installed flatpac and am unable to get sound to work. Perhaps you can help if it works for you?

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I booted into linux-debian-sources-lts-4.9.130-2 but I obtain the error above. Anyway no problem, I solved my issue with flatpak following cardinal adivice and enabling proper kernel entry.  I installed Dota and it seems work fine,  I didn't try it yet.

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