Comment 7 for bug 1700079

We are having the accept same issue on several of our clients starting an 23th June at around 5 am and the numbers was ground till 6pm

/var/log/openvpn.log
Fri Jun 23 11:15:40 2017 OpenVPN 2.3.10 x86_64-pc-linux-gnu [SSL (OpenSSL)] [LZO] [EPOLL] [PKCS11] [MH] [IPv6] built on Jun 22 2017
Fri Jun 23 11:15:40 2017 library versions: OpenSSL 1.0.2g 1 Mar 2016, LZO 2.08
...
Fri Jun 23 11:15:44 2017 Initialization Sequence Completed
Fri Jun 23 11:16:13 2017 event_wait : Interrupted system call (code=4)
Fri Jun 23 11:16:13 2017 /sbin/ip route del XXXX/32
Fri Jun 23 11:16:13 2017 Closing TUN/TAP interface
Fri Jun 23 11:16:13 2017 /sbin/ip addr del dev tun99 XXXXX/16
Fri Jun 23 11:16:13 2017 SIGTERM[hard,] received, process exiting

/var/log/syslog
Jun 23 11:15:40 systemd[1]: Reloading.
Jun 23 11:15:40 systemd[1]: snapd.refresh.timer: Adding 4h 4min 14.083585s random time.
Jun 23 11:15:40 systemd[1]: Started ACPI event daemon.
Jun 23 11:15:41 systemd[1]: Reloading.
Jun 23 11:15:42 systemd[1]: snapd.refresh.timer: Adding 10min 16.345182s random time.
Jun 23 11:15:42 systemd[1]: Started ACPI event daemon.
Jun 23 11:16:13 apt.systemd.daily[30326]: Traceback (most recent call last):
Jun 23 11:16:13 apt.systemd.daily[30326]: File "/usr/bin/unattended-upgrade", line 1473, in <module>
Jun 23 11:16:13 apt.systemd.daily[30326]: main(options)
Jun 23 11:16:13 apt.systemd.daily[30326]: File "/usr/bin/unattended-upgrade", line 1411, in main
Jun 23 11:16:13 apt.systemd.daily[30326]: log_content = get_dpkg_log_content(logfile_dpkg, install_start_time)
Jun 23 11:16:13 apt.systemd.daily[30326]: File "/usr/bin/unattended-upgrade", line 1079, in get_dpkg_log_content
Jun 23 11:16:13 apt.systemd.daily[30326]: for line in fp.readlines():
Jun 23 11:16:13 apt.systemd.daily[30326]: File "/usr/lib/python3.5/codecs.py", line 321, in decode
Jun 23 11:16:13 apt.systemd.daily[30326]: (result, consumed) = self._buffer_decode(data, self.errors, final)
Jun 23 11:16:13 apt.systemd.daily[30326]: UnicodeDecodeError: 'utf-8' codec can't decode byte 0xfc in position 762: invalid start byte
Jun 23 11:16:13 systemd[1]: Started Daily apt activities.
Jun 23 11:16:13 systemd[1]: apt-daily.timer: Adding 9h 9min 19.366153s random time.
Jun 23 11:16:13 systemd[1]: apt-daily.timer: Adding 10h 34min 25.479340s random time.

/var/log/apt/history.log
Start-Date: 2017-06-23 11:15:34
Commandline: /usr/bin/unattended-upgrade
Upgrade: openvpn:amd64 (2.3.10-1ubuntu2, 2.3.10-1ubuntu2.1)
End-Date: 2017-06-23 11:15:42

A simple "service openvpn restart" or of course server reboot fixed the issue for now but this is only a workaround.