ubuntu-fan dep8 failures are due to
https://bugs.launchpad.net/ubuntu/+source/ubuntu-fan/+bug/1830180. It
was fixed in focal+, but in bionic it remains flaky. Explanation is in
https://bugs.launchpad.net/ubuntu/+source/ubuntu-
fan/+bug/1830180/comments/1

I'll retry it once or twice, but we can see from the test output that the test 
worked, and the stderr text is just noise that happened because systemd-resolve 
was called too soon:
Starting fanatic-test
lxd test: Waiting for addresses on eth0 ...
lxd test: Waiting for addresses on eth0 ...
lxd test: Waiting for addresses on eth0 ...
lxd test: Waiting for addresses on eth0 ...
lxd test: Waiting for addresses on eth0 ...
slave: detected primary route through eth0
sd_bus_open_system: No such file or directory <-- too soon
slave: waiting for systemd resolver...
slave: DNS: systemd(250.40.8.1) <--- now it worked, and the test continues
...

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https://bugs.launchpad.net/bugs/1913187

Title:
  iproute2 segfaults when filtering sockets

Status in iproute2 package in Ubuntu:
  Fix Released
Status in iproute2 source package in Bionic:
  Fix Committed

Bug description:
  [Impact]

   * The ss tool crashes when a query returns no results (seg fault)

  [Test Case]

   * $ sudo ss -Hnp -o state established 'dport = 22' src 127.0.0.1 dst 
127.0.0.1
      Segmentation fault

   * PPA with the fix:
  https://launchpad.net/~rafaeldtinoco/+archive/ubuntu/lp1913187

  [Where problems could occur]

   * The ss tool is impacted and it has its code changed for the fix.

   * The fix is a clean cherry-pick and straightforward (moving
  declaration after a NULL check).

  [Other Info]

  When in Ubuntu Bionic, if one calls:

  $ sudo ss -Hnp -o state established 'dport = 22' src 127.0.0.1 dst 127.0.0.1
  tcp              0                    0                                   
127.0.0.1:58910                             127.0.0.1:22               
users:(("ssh",pid=11672,fd=3)) timer:(keepalive,119min,0)

  it works. Just like when in Groovy:

  $ sudo ss -Hnp -o state established 'dport = 22' src 127.0.0.1 dst 127.0.0.1
  tcp               0                    0                                  
127.0.0.1:58908                             127.0.0.1:22               
users:(("ssh",pid=1488591,fd=3)) timer:(keepalive,119min,0)

  but.. if there is nothing to show, in Bionic we get a segfault:

  $ sudo ss -Hnp -o state established 'dport = 22' src 127.0.0.1 dst 127.0.0.1
  Segmentation fault

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