Comment 1 for bug 1704210

ubuntu@autopkgtest:/tmp/autopkgtest.BeZID5/build.9bb/real-tree$ sudo python3 tests/integration.py TestNetworkManager.test_eth_dhcp6_off
test_eth_dhcp6_off (__main__.TestNetworkManager) ... FAIL

======================================================================
FAIL: test_eth_dhcp6_off (__main__.TestNetworkManager)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "tests/integration.py", line 1618, in test_eth_dhcp6_off
    self.assert_iface_up(self.dev_e_client, [], ['inet6 2600:'])
  File "tests/integration.py", line 313, in assert_iface_up
    self.assertNotRegex(out, r, out)
AssertionError: Regex matched: 'inet6 2600:' matches 'inet6 2600:' in '650: eth42@veth42: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000\n link/ether f6:be:d6:b1:7e:b0 brd ff:ff:ff:ff:ff:ff\n inet 192.168.1.100/24 brd 192.168.1.255 scope global eth42\n valid_lft forever preferred_lft forever\n inet6 2600::f4be:d6ff:feb1:7eb0/64 scope global mngtmpaddr dynamic \n valid_lft 3597sec preferred_lft 3597sec\n inet6 fe80::f4be:d6ff:feb1:7eb0/64 scope link \n valid_lft forever preferred_lft forever\n' : 650: eth42@veth42: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether f6:be:d6:b1:7e:b0 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.100/24 brd 192.168.1.255 scope global eth42
       valid_lft forever preferred_lft forever
    inet6 2600::f4be:d6ff:feb1:7eb0/64 scope global mngtmpaddr dynamic
       valid_lft 3597sec preferred_lft 3597sec
    inet6 fe80::f4be:d6ff:feb1:7eb0/64 scope link
       valid_lft forever preferred_lft forever

----------------------------------------------------------------------
Ran 1 test in 7.976s

FAILED (failures=1)