This breakage is due to the latest AppArmor packaging enabling a
unshare-userns-restrict profile by default. In most cases, this allows
more usage of unshare than before (while limiting the attack surface
exposed by capabilities in unprivileged user namespaces), but sbuild is
one of the cases where the new profile imposes more restrictions instead
of loosening them. We are working on an updated sbuild profile to fix
this.
** Changed in: apparmor (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/2098906
Title:
apparmor breaks sbuild with unshare on plucky
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