Finally confirmed:
Jan 05 17:37:50 autopkgtest kernel: audit: type=1400 audit(1704472670.531:106): apparmor="DENIED" operation="userns_create" class="namespace" info="User namespace creation restricted" error=-13 profile="unconfined" pid=269608 comm="ld-linux-x86-64" requested="userns_create" denied="userns_create"
Finally confirmed:
Jan 05 17:37:50 autopkgtest kernel: audit: type=1400 audit(170447267 0.531:106) : apparmor="DENIED" operation= "userns_ create" class="namespace" info="User namespace creation restricted" error=-13 profile= "unconfined" pid=269608 comm="ld- linux-x86- 64" requested= "userns_ create" denied= "userns_ create"