[Bug 1611921] [NEW] no serial console after reboot in do-release-upgrade (14.04)

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Hardware: headless device (Axiomtek NA-330)
Connected to console port (RJ45) via minicom using 115200 8N1
In Ubuntu 14.04 LTS run do-release-upgrade (to Ubuntu 16.04.1 LTS)
At end, confirm reboot
No serial console after that (fortunately the network connection came up allowing ssh access)
Debugging/work-around:
   /etc/default/grub contained GRUB_TERMINAL=serial and
     GRUB_SERIAL_COMMAND="serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1"
     which was reflected in /boot/grub/grub.cfg
   dmesg | grep tty produced
      [    0.000000] console [tty0] enabled
      [    1.612175] 00:02: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
      [    1.632768] 00:03: ttyS1 at I/O 0x2f8 (irq = 3, base_baud = 115200) is a 16550A
   systemctl enable console-getty.service
   systemctl enable serial-getty at ttyS0.service
   systemctl start console-getty.service
   systemctl start serial-getty at ttyS0.service
   Ctrl-A F in minicom returned the login prompt which hadn't worked previously

After the work-around the console port turned out to be ttyS0 so some of
the above may not be necessary.

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
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no serial console after reboot in do-release-upgrade (14.04)
https://bugs.launchpad.net/bugs/1611921
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