I was able to reproduce it in a freshly installed VM (VMware).
----------------------
root@ubuntu:~# egrep -v '(^\s*//.*$|^\s*$)'
/etc/apt/apt.conf.d/50unattended-upgrades
Unattended-Upgrade::Allowed-Origins {
"${distro_id}:${distro_codename}";
"${distro_id}:${distro_codename}-security";
"${distro_id}ESM:${distro_codename}";
};
Unattended-Upgrade::Package-Blacklist {
};
Unattended-Upgrade::Automatic-Reboot "true";
root@ubuntu:~# uname -a
Linux ubuntu 4.4.0-104-generic #127-Ubuntu SMP Mon Dec 11 12:16:42 UTC 2017
x86_64 x86_64 x86_64 GNU/Linux
root@ubuntu:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.3 LTS
Release: 16.04
Codename: xenial
root@ubuntu:~# apt-get update && apt-get dist-upgrade -y
Get:1 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]
Hit:2 http://us.archive.ubuntu.com/ubuntu xenial InRelease
Get:3 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB]
Get:4 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB]
Fetched 306 kB in 2s (146 kB/s)
Reading package lists... Done
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
root@ubuntu:~# file /var/run/reboot-required
/var/run/reboot-required: cannot open `/var/run/reboot-required' (No such file
or directory)
root@ubuntu:~# touch /var/run/reboot-required
root@ubuntu:~# unattended-upgrades --dry-run
(ssh disconnects, system reboots)
root@ubuntu:~# cat /var/log/unattended-upgrades/unattended-upgrades.log
2017-12-16 09:59:17,772 INFO Initial blacklisted packages:
2017-12-16 09:59:17,773 INFO Initial whitelisted packages:
2017-12-16 09:59:17,773 INFO Starting unattended upgrades script
2017-12-16 09:59:17,773 INFO Allowed origins are: ['o=Ubuntu,a=xenial',
'o=Ubuntu,a=xenial-security', 'o=UbuntuESM,a=xenial']
2017-12-16 09:59:21,610 INFO No packages found that can be upgraded unattended
and no pending auto-removals
2017-12-16 09:59:21,611 WARNING Found /var/run/reboot-required, rebooting
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https://bugs.launchpad.net/bugs/1269177
Title:
Running 'unattended-upgrades --dry-run' reboots the machine
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