/usr/src/linux-headers-4.15.0-20/net/netlink/Kconfig is in linux-headers-4.15.0-20 4.15.0-20.21~16.04.1.
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# Netlink Sockets
#
config NETLINK_DIAG
tristate "NETLINK: socket monitoring interface"
default n
---help---
Support for NETLINK socket monitoring interface used by the ss tool.
If unsure, say Y.
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