Comment 22 for bug 1687129

Yakkety output, before:

$ sudo unattended-upgrades --debug --dry-run
Initial blacklisted packages:
Initial whitelisted packages:
Starting unattended upgrades script
Allowed origins are: ['o=Ubuntu,a=yakkety', 'o=Ubuntu,a=yakkety-security']
adjusting candidate version: 'unattended-upgrades=0.92ubuntu1'
pkgs that look like they should be upgraded:
Fetched 0 B in 0s (0 B/s)
fetch.run() result: 0
blacklist: []
whitelist: []
No packages found that can be upgraded unattended and no pending auto-removals
$

after:

$ sudo unattended-upgrades --debug --dry-run
Initial blacklisted packages:
Initial whitelisted packages:
Starting unattended upgrades script
Allowed origins are: ['o=Ubuntu,a=yakkety', 'o=Ubuntu,a=yakkety-security', 'o=UbuntuESM,a=yakkety']
adjusting candidate version: 'binutils=2.27-8ubuntu2'
adjusting candidate version: 'binutils-arm-linux-gnueabihf=2.27-8ubuntu2'
adjusting candidate version: 'iproute2=4.3.0-1ubuntu3'
adjusting candidate version: 'less=481-2.1ubuntu1'
adjusting candidate version: 'libssl1.0.0=1.0.2g-1ubuntu9'
adjusting candidate version: 'linux-libc-dev=4.8.0-22.24'
adjusting candidate version: 'openssl=1.0.2g-1ubuntu9'
adjusting candidate version: 'sudo=1.8.16-0ubuntu3'
Checking: unattended-upgrades ([<Origin component:'main' archive:'yakkety' origin:'UbuntuESM' label:'UbuntuESM' site:'esm.ubuntu.com' isTrusted:True>])
pkgs that look like they should be upgraded: unattended-upgrades
Err https://esm.ubuntu.com/ubuntu precise/main amd64 unattended-upgrades all 0.92ubuntu1.6
  404 Not Found
[...]
$