/sbin/shutdown, post upgrade not working, imho is a severe bug. I'll
investigate that. I suspect that because we cannot restart dbus things
don't show up there, but /sbin/shutdown should be smart enough to do
something. I guess the scheduling of timeout is failing, but
/sbin/shutdown now works?
Re differences between halt & poweroff, in systemd, eventually it
results in:
case ACTION_HALT:
(void) reboot(RB_HALT_SYSTEM);
case ACTION_POWEROFF:
(void) reboot(RB_POWER_OFF);
For completeness reboot typically is:
(void) reboot(RB_AUTOBOOT);
of if parameter was specified (aka androidish - reboot recovery):
(void) raw_reboot(LINUX_REBOOT_CMD_RESTART2, parameter);
This is the same as with upstart's implementation:
case REBOOT:
reboot (RB_AUTOBOOT);
case HALT:
reboot (RB_HALT_SYSTEM);
case POWEROFF:
reboot (RB_POWER_OFF);
case REBOOTCOMMAND:
syscall (SYS_reboot,
LINUX_REBOOT_MAGIC1,
LINUX_REBOOT_MAGIC2,
LINUX_REBOOT_CMD_RESTART2,
rebootcommand);
Differences between RB_HALT_SYSTEM and RB_POWER_OFF can be read in the
linux manpage here:
http://manpages.ubuntu.com/manpages/bionic/en/man2/reboot.2.html
I have not read kernel code in a while for this, but if i'm not mistaken
poweroff fallsback to halt, in the kernel, if there is no hardware
support to kill power.
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https://bugs.launchpad.net/bugs/1670291
Title:
Landscape: Upgrade 14.04.5 to 16.04.2 fails unable to reboot
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