Unprivileged user namespaces / kernel.unprivileged_userns_clone / Can not run flatpak apps / AppImages after Kicksecure update

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security-misc changed in this release:

kernel.unprivileged_userns_clone=0

Temporary workaround to undo this setting (untested):

sudo sysctl -w kernel.unprivileged_userns_clone=1
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Cannot run some AppImage apps after Kicksecure upate
Impossible to start Evolution app since the last update