@nacc: Add-on: On my Debian systems (Debian jessie and stretch) that also experience this issue, however, the lines do look like what you described - and still the system hangs at reboot / shutdown.
In a previous message it sounded like you had identified an issue and a fix - did I misinterpret your response? If so, was it a fix I can apply to my xenial system and test?
@nacc: Add-on: On my Debian systems (Debian jessie and stretch) that also experience this issue, however, the lines do look like what you described - and still the system hangs at reboot / shutdown.
In a previous message it sounded like you had identified an issue and a fix - did I misinterpret your response? If so, was it a fix I can apply to my xenial system and test?