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Subject: Re: unshare -m for non-root user
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>> complain to Debian. iirc, they break their kernels on purpose by adding
>> non-standard caps which disallow userns usage.
>
> Ok, I found out that on Debian one needs to make the follwing entry in
> /etc/sysctl.conf:
> kernel.unprivileged_userns_clone = 1
> and reboot, or do sysctl -p /etc/sysctl.conf, or equivalently
> echo 1 > /proc/sys/kernel/unprivileged_userns_clone

The kernel will neded to be compiled with CONFIG_USER_NS