Tested with 1.1ubuntu1.18.04.7~16.04.2 on Xenial:

root@x-uu-lp-1260041:~# unattended-upgrade --dry-run --verbose --debug
Initial blacklisted packages: 
Initial whitelisted packages: 
Starting unattended upgrades script
Allowed origins are: o=Ubuntu,a=xenial, o=Ubuntu,a=xenial-security, 
o=UbuntuESM,a=xenial, o=Ubuntu,a=xenial-updates
Using 
(^linux-image-[0-9]+\.[0-9\.]+-.*|^linux-headers-[0-9]+\.[0-9\.]+-.*|^linux-image-extra-[0-9]+\.[0-9\.]+-.*|^linux-modules-[0-9]+\.[0-9\.]+-.*|^linux-modules-extra-[0-9]+\.[0-9\.]+-.*|^linux-signed-image-[0-9]+\.[0-9\.]+-.*|^kfreebsd-image-[0-9]+\.[0-9\.]+-.*|^kfreebsd-headers-[0-9]+\.[0-9\.]+-.*|^gnumach-image-[0-9]+\.[0-9\.]+-.*|^.*-modules-[0-9]+\.[0-9\.]+-.*|^.*-kernel-[0-9]+\.[0-9\.]+-.*|^linux-backports-modules-.*-[0-9]+\.[0-9\.]+-.*|^linux-modules-.*-[0-9]+\.[0-9\.]+-.*|^linux-tools-[0-9]+\.[0-9\.]+-.*|^linux-cloud-tools-[0-9]+\.[0-9\.]+-.*)
 regexp to find kernel packages
Using 
(^linux-image-4\.18\.0\-16\-generic$|^linux-headers-4\.18\.0\-16\-generic$|^linux-image-extra-4\.18\.0\-16\-generic$|^linux-modules-4\.18\.0\-16\-generic$|^linux-modules-extra-4\.18\.0\-16\-generic$|^linux-signed-image-4\.18\.0\-16\-generic$|^kfreebsd-image-4\.18\.0\-16\-generic$|^kfreebsd-headers-4\.18\.0\-16\-generic$|^gnumach-image-4\.18\.0\-16\-generic$|^.*-modules-4\.18\.0\-16\-generic$|^.*-kernel-4\.18\.0\-16\-generic$|^linux-backports-modules-.*-4\.18\.0\-16\-generic$|^linux-modules-.*-4\.18\.0\-16\-generic$|^linux-tools-4\.18\.0\-16\-generic$|^linux-cloud-tools-4\.18\.0\-16\-generic$)
 regexp to find running kernel packages
Checking: cloud-init ([<Origin component:'main' archive:'xenial-proposed' 
origin:'Ubuntu' label:'Ubuntu' site:'archive.ubuntu.com' isTrusted:True>])
adjusting candidate version: cloud-init=18.5-21-g8ee294d5-0ubuntu1~16.04.1
Checking: distro-info-data ([<Origin component:'main' archive:'xenial-proposed' 
origin:'Ubuntu' label:'Ubuntu' site:'archive.ubuntu.com' isTrusted:True>])
pkg distro-info-data not in allowed origin
sanity check failed
Checking: libpam-systemd ([<Origin component:'main' archive:'xenial-updates' 
origin:'Ubuntu' label:'Ubuntu' site:'archive.ubuntu.com' isTrusted:True>])
Checking: libsystemd0 ([<Origin component:'main' archive:'xenial-updates' 
origin:'Ubuntu' label:'Ubuntu' site:'archive.ubuntu.com' isTrusted:True>])
Checking: libudev1 ([<Origin component:'main' archive:'xenial-updates' 
origin:'Ubuntu' label:'Ubuntu' site:'archive.ubuntu.com' isTrusted:True>])
Checking: snapd ([<Origin component:'main' archive:'xenial-proposed' 
origin:'Ubuntu' label:'Ubuntu' site:'archive.ubuntu.com' isTrusted:True>])
adjusting candidate version: snapd=2.34.2ubuntu0.1
Checking: systemd ([<Origin component:'main' archive:'xenial-updates' 
origin:'Ubuntu' label:'Ubuntu' site:'archive.ubuntu.com' isTrusted:True>])
Checking: systemd-sysv ([<Origin component:'main' archive:'xenial-updates' 
origin:'Ubuntu' label:'Ubuntu' site:'archive.ubuntu.com' isTrusted:True>])
Checking: ubuntu-core-launcher ([<Origin component:'main' 
archive:'xenial-proposed' origin:'Ubuntu' label:'Ubuntu' 
site:'archive.ubuntu.com' isTrusted:True>])
adjusting candidate version: ubuntu-core-launcher=2.34.2ubuntu0.1
Checking: udev ([<Origin component:'main' archive:'xenial-updates' 
origin:'Ubuntu' label:'Ubuntu' site:'archive.ubuntu.com' isTrusted:True>])
pkgs that look like they should be upgraded: libpam-systemd
libsystemd0
libudev1
systemd
systemd-sysv
udev
Fetched 0 B in 0s (0 B/s)                                                       
                                                                                
             
fetch.run() result: 0
<apt_pkg.AcquireItem object:Status: 2 Complete: 1 Local: 1 IsTrusted: 1 
FileSize: 11468 
DestFile:'/var/cache/apt/archives/systemd-sysv_229-4ubuntu21.17_amd64.deb' 
DescURI: 
'http://archive.ubuntu.com/ubuntu/pool/main/s/systemd/systemd-sysv_229-4ubuntu21.17_amd64.deb'
 ID:0 ErrorText: ''>
check_conffile_prompt(/var/cache/apt/archives/systemd-sysv_229-4ubuntu21.17_amd64.deb)
found pkg: systemd-sysv
No conffiles in deb 
/var/cache/apt/archives/systemd-sysv_229-4ubuntu21.17_amd64.deb (There is no 
member named 'conffiles')
<apt_pkg.AcquireItem object:Status: 2 Complete: 1 Local: 1 IsTrusted: 1 
FileSize: 115114 
DestFile:'/var/cache/apt/archives/libpam-systemd_229-4ubuntu21.17_amd64.deb' 
DescURI: 
'http://archive.ubuntu.com/ubuntu/pool/main/s/systemd/libpam-systemd_229-4ubuntu21.17_amd64.deb'
 ID:0 ErrorText: ''>
check_conffile_prompt(/var/cache/apt/archives/libpam-systemd_229-4ubuntu21.17_amd64.deb)
found pkg: libpam-systemd
No conffiles in deb 
/var/cache/apt/archives/libpam-systemd_229-4ubuntu21.17_amd64.deb (There is no 
member named 'conffiles')
<apt_pkg.AcquireItem object:Status: 2 Complete: 1 Local: 1 IsTrusted: 1 
FileSize: 204002 
DestFile:'/var/cache/apt/archives/libsystemd0_229-4ubuntu21.17_amd64.deb' 
DescURI: 
'http://archive.ubuntu.com/ubuntu/pool/main/s/systemd/libsystemd0_229-4ubuntu21.17_amd64.deb'
 ID:0 ErrorText: ''>
check_conffile_prompt(/var/cache/apt/archives/libsystemd0_229-4ubuntu21.17_amd64.deb)
found pkg: libsystemd0
No conffiles in deb 
/var/cache/apt/archives/libsystemd0_229-4ubuntu21.17_amd64.deb (There is no 
member named 'conffiles')
<apt_pkg.AcquireItem object:Status: 2 Complete: 1 Local: 1 IsTrusted: 1 
FileSize: 3813730 
DestFile:'/var/cache/apt/archives/systemd_229-4ubuntu21.17_amd64.deb' DescURI: 
'http://archive.ubuntu.com/ubuntu/pool/main/s/systemd/systemd_229-4ubuntu21.17_amd64.deb'
 ID:0 ErrorText: ''>
check_conffile_prompt(/var/cache/apt/archives/systemd_229-4ubuntu21.17_amd64.deb)
found pkg: systemd
conffile line: /etc/dbus-1/system.d/org.freedesktop.hostname1.conf 
f55c94d000b5d62b5f06d38852977dd1
current md5: f55c94d000b5d62b5f06d38852977dd1
conffile line: /etc/dbus-1/system.d/org.freedesktop.locale1.conf 
5893ab03e7e96aa3759baceb4dd04190
current md5: 5893ab03e7e96aa3759baceb4dd04190
conffile line: /etc/dbus-1/system.d/org.freedesktop.login1.conf 
4aac4fe1a99c9fca83c85b80e4e0c2ba
current md5: 4aac4fe1a99c9fca83c85b80e4e0c2ba
conffile line: /etc/dbus-1/system.d/org.freedesktop.network1.conf 
162e9a90d8f824f79ef2c6390827ec7b
current md5: 162e9a90d8f824f79ef2c6390827ec7b
conffile line: /etc/dbus-1/system.d/org.freedesktop.resolve1.conf 
6969148b4616c56a5c9065cec5ab0775
current md5: 6969148b4616c56a5c9065cec5ab0775
conffile line: /etc/dbus-1/system.d/org.freedesktop.systemd1.conf 
846824928e39a465c06c3aae53510535
current md5: 846824928e39a465c06c3aae53510535
conffile line: /etc/dbus-1/system.d/org.freedesktop.timedate1.conf 
682369fbf3de26b21e775732c89a2bbe
current md5: 682369fbf3de26b21e775732c89a2bbe
conffile line: /etc/dhcp/dhclient-exit-hooks.d/timesyncd 
a891f21f45b0648b7082d999bf424591
current md5: a891f21f45b0648b7082d999bf424591
conffile line: /etc/pam.d/systemd-user 3bdb96b18046bd209135cdfe73421db6
current md5: 3bdb96b18046bd209135cdfe73421db6
conffile line: /etc/systemd/bootchart.conf 7cb6c9cab8ec511882e0e05fceb87e45
current md5: 7cb6c9cab8ec511882e0e05fceb87e45
conffile line: /etc/systemd/journald.conf d928a3ce9f51fcff8ed925270f14a2aa
current md5: d928a3ce9f51fcff8ed925270f14a2aa
conffile line: /etc/systemd/logind.conf 5b41bb868487d1013382b738f6648328
current md5: 5b41bb868487d1013382b738f6648328
conffile line: /etc/systemd/resolved.conf cc77726b02979ddc8b034a338f7bdea9
current md5: cc77726b02979ddc8b034a338f7bdea9
conffile line: /etc/systemd/system.conf 1340491c660f9eb234c92fe1225ff427
current md5: 1340491c660f9eb234c92fe1225ff427
conffile line: /etc/systemd/timesyncd.conf 4e1cf2b5f85dff6c1f186135b9f66a85
current md5: 4e1cf2b5f85dff6c1f186135b9f66a85
conffile line: /etc/systemd/user.conf 2eaf5976751be8864d0555f30814d832
current md5: 2eaf5976751be8864d0555f30814d832
<apt_pkg.AcquireItem object:Status: 2 Complete: 1 Local: 1 IsTrusted: 1 
FileSize: 993100 
DestFile:'/var/cache/apt/archives/udev_229-4ubuntu21.17_amd64.deb' DescURI: 
'http://archive.ubuntu.com/ubuntu/pool/main/s/systemd/udev_229-4ubuntu21.17_amd64.deb'
 ID:0 ErrorText: ''>
check_conffile_prompt(/var/cache/apt/archives/udev_229-4ubuntu21.17_amd64.deb)
found pkg: udev
conffile line: /etc/init.d/udev e4da2ae5c153148fad0b3f6e5e7ce61e
current md5: e4da2ae5c153148fad0b3f6e5e7ce61e
conffile line: /etc/init/udev.conf 41c0081f3a830e0902aaff76a53edf98
current md5: 41c0081f3a830e0902aaff76a53edf98
conffile line: /etc/init/udevmonitor.conf ec187fc822d47c41416e7c531c8c48dd
current md5: ec187fc822d47c41416e7c531c8c48dd
conffile line: /etc/init/udevtrigger.conf 651ff2421dde80be7ce7ccbf7fa8cf18
current md5: 651ff2421dde80be7ce7ccbf7fa8cf18
conffile line: /etc/modprobe.d/fbdev-blacklist.conf 
0b9c466830040ec52986cc3ea117bef5
current md5: 0b9c466830040ec52986cc3ea117bef5
conffile line: /etc/udev/udev.conf a9c43ddab6e58eefa56db50ff44b2b46
current md5: a9c43ddab6e58eefa56db50ff44b2b46
<apt_pkg.AcquireItem object:Status: 2 Complete: 1 Local: 1 IsTrusted: 1 
FileSize: 53928 
DestFile:'/var/cache/apt/archives/libudev1_229-4ubuntu21.17_amd64.deb' DescURI: 
'http://archive.ubuntu.com/ubuntu/pool/main/s/systemd/libudev1_229-4ubuntu21.17_amd64.deb'
 ID:0 ErrorText: ''>
check_conffile_prompt(/var/cache/apt/archives/libudev1_229-4ubuntu21.17_amd64.deb)
found pkg: libudev1
No conffiles in deb /var/cache/apt/archives/libudev1_229-4ubuntu21.17_amd64.deb 
(There is no member named 'conffiles')
blacklist: []
whitelist: []
Option --dry-run given, *not* performing real actions
Packages that will be upgraded: libpam-systemd libsystemd0 libudev1 systemd 
systemd-sysv udev
Writing dpkg log to /var/log/unattended-upgrades/unattended-upgrades-dpkg.log
applying set ['systemd-sysv']
/usr/bin/dpkg --status-fd 9 --unpack --auto-deconfigure 
/var/cache/apt/archives/systemd-sysv_229-4ubuntu21.17_amd64.deb 
/usr/bin/dpkg --status-fd 11 --configure systemd-sysv:amd64 
/usr/bin/dpkg --status-fd 13 --configure --pending 
left to upgrade {'udev', 'libpam-systemd', 'libudev1', 'libsystemd0', 'systemd'}
applying set ['udev', 'libudev1']
/usr/bin/dpkg --status-fd 9 --unpack --auto-deconfigure 
/var/cache/apt/archives/udev_229-4ubuntu21.17_amd64.deb 
/var/cache/apt/archives/libudev1_229-4ubuntu21.17_amd64.deb 
/usr/bin/dpkg --status-fd 11 --configure libudev1:amd64 udev:amd64 
/usr/bin/dpkg --status-fd 13 --configure --pending 
left to upgrade {'libpam-systemd', 'libsystemd0', 'systemd'}
applying set ['libsystemd0', 'libpam-systemd', 'systemd']
/usr/bin/dpkg --status-fd 9 --unpack --auto-deconfigure 
/var/cache/apt/archives/libpam-systemd_229-4ubuntu21.17_amd64.deb 
/var/cache/apt/archives/libsystemd0_229-4ubuntu21.17_amd64.deb 
/usr/bin/dpkg --status-fd 11 --configure libsystemd0:amd64 
/usr/bin/dpkg --status-fd 13 --unpack --auto-deconfigure 
/var/cache/apt/archives/systemd_229-4ubuntu21.17_amd64.deb 
/usr/bin/dpkg --status-fd 15 --configure systemd:amd64 libpam-systemd:amd64 
/usr/bin/dpkg --status-fd 17 --configure --pending 
left to upgrade set()
All upgrades installed
InstCount=0 DelCount=0 BrokenCount=0
root@x-uu-lp-1260041:~# dpkg -l unattended-upgrades | cat
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                Version                    Architecture Description
+++-===================-==========================-============-===========================================
ii  unattended-upgrades 1.1ubuntu1.18.04.7~16.04.2 all          automatic 
installation of security upgrades
root@x-uu-lp-1260041:~#



root@x-uu-lp-1260041:~#  while sleep 0.1; do python3 -c 'import apt, apt_pkg, 
time; print(apt_pkg.pkgsystem_lock()); time.sleep(2)' ; done
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: E:Could not get lock /var/lib/dpkg/lock-frontend - open (11: 
Resource temporarily unavailable), E:Unable to acquire the dpkg frontend lock 
(/var/lib/dpkg/lock-frontend), is another process using it?
True
True
...

I also installed apt and related packages from -proposed:

root@x-uu-lp-1260041:~# dpkg -l python3-apt | cat
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name           Version                    Architecture Description
+++-==============-==========================-============-=================================
ii  python3-apt    1.1.0~beta1ubuntu0.16.04.3 amd64        Python 3 interface 
to libapt-pkg


** Tags removed: verification-needed verification-needed-xenial
** Tags added: verification-done verification-done-xenial

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https://bugs.launchpad.net/bugs/1260041

Title:
  Unattended-Upgrades crashes with a dpkg error

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