reboot command is SysV-init compatibility command and is specified as

Why are you typing reboot? seriously this is not something desktop users
typically do, at all =)

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  Non-root user can reboot machine from the command line

Status in systemd package in Ubuntu:

Bug description:
  Open a gnome-terminal as your normal user and type 'reboot' and ENTER.
  The PC reboots immediately, losing all unsaved work for all users
  (this is the case on both my VM and laptop running Ubuntu 18.04, so I
  don't think it's a weird configuration issue).

  In the old days, didn't you have to be root (or sudoed) for this
  command to work?

  While we're on the subject, wouldn't it be nicer if the reboot command
  (ie when run as root) asked you to confirm before executing, pointing
  out that all unsaved work for all users will be lost?

  Note that you can't reboot a server if you are logged in via ssh as a
  non-root user:

  Failed to set wall message, ignoring: Interactive authentication required.
  Failed to reboot system via logind: Interactive authentication required.
  Failed to open /dev/initctl: Permission denied
  Failed to talk to init daemon.

  I am assuming this is a systemd issue, because reboot just links to 
systemctl, and systemctl can be executed by non-root users:

  $ ll /sbin/reboot /bin/systemctl
  -rwxr-xr-x 1 root root 182352 Dec 12 21:25 /bin/systemctl*
  lrwxrwxrwx 1 root root     14 Dec 12 21:25 /sbin/reboot -> /bin/systemctl*

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: systemd 235-3ubuntu3
  ProcVersionSignature: Ubuntu 4.13.0-32.35-generic 4.13.13
  Uname: Linux 4.13.0-32-generic x86_64
  ApportVersion: 2.20.8-0ubuntu8
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Feb  8 12:49:33 2018
  InstallationDate: Installed on 2017-12-18 (51 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20171212)
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 002: ID 80ee:0021 VirtualBox USB Tablet
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: innotek GmbH VirtualBox
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-32-generic 
root=UUID=dd72d916-58fc-49a1-9798-feded5ce6eff ro quiet splash
  SourcePackage: systemd
   [EXTENDED]   /lib/systemd/system/rc-local.service → 
   [EXTENDED]   /lib/systemd/system/user@.service → 

   2 overridden configuration files found.
  UpgradeStatus: No upgrade log present (probably fresh install) 12/01/2006
  dmi.bios.vendor: innotek GmbH
  dmi.bios.version: VirtualBox VirtualBox
  dmi.board.vendor: Oracle Corporation
  dmi.board.version: 1.2
  dmi.chassis.type: 1
  dmi.chassis.vendor: Oracle Corporation
dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr: Virtual Machine VirtualBox
  dmi.product.version: 1.2
  dmi.sys.vendor: innotek GmbH

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