flatpak, Steam and non-privileged namespaces

[stamasd]

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.

[cardinal]

Default setting is disabled:

# cat /proc/sys/kernel/unprivileged_userns_clone 
0

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 
1

 

[cardinal]

This user override only exists if booted into a debian patched kernel:

/proc/sys/kernel/unprivileged_userns_clone 

[stamasd]

15 hours ago, cardinal said:

Default setting is disabled:

# cat /proc/sys/kernel/unprivileged_userns_clone 
0

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 
1

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

(edit) Yes it works fine.

[synteejol]

Hi, I tried to do what cardinal said but I got this

 

/proc/sys/kernel/unprivileged_userns_clone: No such file or directory

what should I do?

[cardinal]

@synteejol

You will only see

/proc/sys/kernel/unprivileged_userns_clone

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.

@stamasd

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

[synteejol]

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.