WARNING: CONFIG_IPC_NS is invalid
Value is: n
Allowed values : y, !
Comment says: optional, enables kernel namespaces for systemd-nspawn containers

WARNING: CONFIG_UTS_NS is invalid
Value is: n
Allowed values : y, !
Comment says: optional, enables kernel namespaces for systemd-nspawn containers

WARNING: CONFIG_BTRFS_FS is invalid
Value is: n
Allowed values : y, !
Comment says: optional extra filesystem (BTRFS)