The test script fails at the following part:

        # test external mode
        ip -netns "$testns" link add dev "$DEV_NS" type ip6gretap external
        check_err $?

Which executes:

# ip -netns testns link add dev ip6gretap00 type ip6gretap external

Looking at ip-link(8) manpage, the ip6gretap type accepts the following
options:

ip link add DEVICE type { ip6gre | ip6gretap } remote ADDR local ADDR [ 
[i|o]seq ]
              [ [i|o]key KEY ] [ [i|o]csum ] [ hoplimit TTL ] [ encaplimit ELIM 
] [ tclass TCLASS
              ] [ flowlabel FLOWLABEL ] [ dscp inherit ] [ dev PHYS_DEV ]

So "external" is not supported yet in this iproute2 version
(4.15.0-2ubuntu).

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https://bugs.launchpad.net/bugs/1896448

Title:
  ip6gretap / erspan / ip6erspan in rtnetlink.sh from net of
  ubuntu_kernel_selftests failed on B-5.4-aws / B-5.4-gke / B-5.4-oracle
  / B-5.4-azure / B-5.4

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