[Bug 1670291] Re: Landscape: Upgrade 14.04.5 to 16.04.2 fails unable to reboot

[Dimitri John Ledkov]

/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

Status in landscape-client package in Ubuntu:
  Fix Committed
Status in systemd package in Ubuntu:
  Incomplete
Status in landscape-client source package in Xenial:
  Confirmed
Status in systemd source package in Xenial:
  Incomplete

Bug description:
  Used Landscape (Paid Canonical Subscription) to upgrade one of my
  machines.

  Landscape only shows "In Progress" for more than 8 hours now and asked
  for a reboot of the machine in a second alert.

  In the reboot attempt I get the message:
  =========================
  Failed to set wall message, ignoring: Method "SetWallMessage" with signature "sb" on interface "org.freedesktop.login1.Manager" doesn't exist
  Failed to call ScheduleShutdown in logind, proceeding with immediate shutdown: Method "ScheduleShutdown" with signature "st" on interface "org.freedesktop.login1.Manager" doesn't exist
  =========================

  Steps to reproduce:
  * Fully updated 14.04.5 machine
  * Open Landscape
  * Choose the machine
  * Choose Packages
  * This computer can be upgraded to a newer release
  * Apply
  * Wait 2 hours
  * Alert comes in a seperate Landscape message Machine is ready for reboot
  * Choose Info... Power
  * Deliver to selected computers as soon as possible
  * Error message

  I found this thread on reddit about this issue maybe the solution can be built into the upgrade script
  https://www.reddit.com/r/linuxquestions/comments/4wy3go/trying_to_run_as_user_instance_but_the_system_has/

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