SUDO fehlt
öffne mit root  /etc/sudoers
Bei user muss dein Username rein.
Siehe auch auf der Bugseite rechts shutdown geht nicht nach der Installation

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#
# This file MUST be edited with the ‘visudo’ command as root.
#
# Please consider adding local content in /etc/sudoers.d/ instead of
# directly modifying this file.
#
# See the man page for details on how to write a sudoers file.
#
Defaults    env_reset
Defaults    mail_badpass
Defaults  secure_path=”/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin”

# Host alias specification
User_Alias      MYADMINS = user

# User alias specification

# Cmnd alias specification
Cmnd_Alias      SHUTDOWN = /sbin/reboot, /sbin/poweroff
Cmnd_Alias      PKGMGMT = /usr/bin/dpkg, /usr/bin/apt-get, /usr/bin/aptitude

# User privilege specification
root    ALL=(ALL:ALL) ALL

# Allow members of group sudo to execute any command
%sudo    ALL=(ALL:ALL) ALL

# See sudoers(5) for more information on “#include” directives:

#includedir /etc/sudoers.d

# Users listed above (MYADMINS) can run package managers and reboot the system.
MYADMINS ALL = PKGMGMT, SHUTDOWN