Comment 23 for bug 1687129

zesty, output before:
$ sudo unattended-upgrades --debug --dry-run
Initial blacklisted packages:
Initial whitelisted packages:
Starting unattended upgrades script
Allowed origins are: ['o=Ubuntu,a=zesty', 'o=Ubuntu,a=zesty-security']
adjusting candidate version: 'linux-libc-dev=4.10.0-19.21'
adjusting candidate version: 'unattended-upgrades=0.93.1ubuntu2'
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=zesty', 'o=Ubuntu,a=zesty-security', 'o=UbuntuESM,a=zesty']
adjusting candidate version: 'libgssapi-krb5-2=1.15-1'
adjusting candidate version: 'libk5crypto3=1.15-1'
adjusting candidate version: 'libkrb5-3=1.15-1'
adjusting candidate version: 'libkrb5support0=1.15-1'
adjusting candidate version: 'libssl1.0.0=1.0.2g-1ubuntu11'
adjusting candidate version: 'linux-libc-dev=4.10.0-19.21'
adjusting candidate version: 'openssl=1.0.2g-1ubuntu11'
Checking: unattended-upgrades ([<Origin component:'main' archive:'zesty' 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 0.93.1ubuntu2.3
  404 Not Found
Fetched 0 B in 0s (0 B/s)
fetch.run() result: 0
[...]
$