sudo service network-manager restart

marjorie@grendel:~$ locale
LANG=en_GB.UTF-8
LANGUAGE=en_GB:en
LC_CTYPE="en_GB.UTF-8"
LC_NUMERIC="en_GB.UTF-8"
LC_TIME="en_GB.UTF-8"
LC_COLLATE="en_GB.UTF-8"
LC_MONETARY="en_GB.UTF-8"
LC_MESSAGES="en_GB.UTF-8"
LC_PAPER="en_GB.UTF-8"
LC_NAME="en_GB.UTF-8"
LC_ADDRESS="en_GB.UTF-8"
LC_TELEPHONE="en_GB.UTF-8"
LC_MEASUREMENT="en_GB.UTF-8"
LC_IDENTIFICATION="en_GB.UTF-8"
LC_ALL=

Selecting previously unselected package lnav.
Preparing to unpack .../lnav_0.8.4-5_amd64.deb ...
Unpacking lnav (0.8.4-5) ...
Setting up libpcrecpp0v5:amd64 (2:8.39-12) ...
Setting up nvidia-persistenced (418.56-1) ...
Starting NVIDIA Persistence Daemon
nvidia-persistenced failed to initialize. Check syslog for more details.
invoke-rc.d: initscript nvidia-persistenced, action "start" failed.
dpkg: error processing package nvidia-persistenced (--configure):
 installed nvidia-persistenced package post-installation script subprocess returned error exit status 1
Setting up lnav (0.8.4-5) ...
Processing triggers for man-db (2.8.5-2) ...
Processing triggers for libc-bin (2.28-10) ...
Errors were encountered while processing:
 nvidia-persistenced
E: Sub-process /usr/bin/dpkg returned an error code (1)
A package failed to install.  Trying to recover:
Setting up nvidia-persistenced (418.56-1) ...
Starting NVIDIA Persistence Daemon
nvidia-persistenced failed to initialize. Check syslog for more details.
invoke-rc.d: initscript nvidia-persistenced, action "start" failed.
dpkg: error processing package nvidia-persistenced (--configure):
 installed nvidia-persistenced package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
 nvidia-persistenced

#!/bin/sh -e
#
# NVIDIA Persistence Daemon Init Script
#
# Copyright (c) 2013 NVIDIA Corporation
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
#
# This is a sample System V init script, designed to show how the NVIDIA
# Persistence Daemon can be started.
#
# This sample does not rely on any init system functions, to ensure the
# widest portability possible.
#
# chkconfig: 2345 99 01
# description: Starts and stops the NVIDIA Persistence Daemon
# processname: nvidia-persistenced
#
### BEGIN INIT INFO
# Provides:         nvidia-persistenced
# Required-Start:   $ALL
# Required-Stop:    $ALL
# Default-Start:    2 3 4 5
# Default-Stop:     0 1 6
# Description:      Starts and stops the NVIDIA Persistence Daemon
### END INIT INFO

NVPD=nvidia-persistenced
NVPD_BIN=/usr/bin/${NVPD}
NVPD_RUNTIME=/var/run/${NVPD}
NVPD_PIDFILE=${NVPD_RUNTIME}/${NVPD}.pid
NVPD_USER=nvpd

if [ -f ${NVPD_PIDFILE} ]; then
  read -r NVPD_PID < "${NVPD_PIDFILE}"
  # Remove stale runtime files
  if [ "${NVPD_PID}" ] && [ ! -d /proc/${NVPD_PID} ]; then
    unset NVPD_PID
    rm -rf "${NVPD_RUNTIME}"
  fi
fi

case "${1}" in
  start)
   echo "Starting NVIDIA Persistence Daemon"
# Execute the daemon as the intended user
   ${NVPD_BIN} --user ${NVPD_USER}
    ;;
  stop)
   echo "Stopping NVIDIA Persistence Daemon"
   # Stop the daemon - its PID should have been read in
   [ ! -z "${NVPD_PID}" ] && kill ${NVPD_PID} &> /dev/null
   ;;
  restart)
   $0 stop
   sleep 2
   $0 start
   ;;
  *) echo "usage: $0 {start|stop|restart}"
   ;;
esac
exit 0

#!/bin/sh -e
#
# NVIDIA Persistence Daemon Init Script
#
# Copyright (c) 2013 NVIDIA Corporation
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
#
# This is a sample System V init script, designed to show how the NVIDIA
# Persistence Daemon can be started.
#
# This sample does not rely on any init system functions, to ensure the
# widest portability possible.
#
# chkconfig: 2345 99 01
# description: Starts and stops the NVIDIA Persistence Daemon
# processname: nvidia-persistenced
#
### BEGIN INIT INFO
# Provides:         nvidia-persistenced
# Required-Start:   $local_fs
# Required-Stop:    $local_fs
# Default-Start:    2 3 4 5
# Default-Stop:     0 1 6
# Short-Description: Starts and stops the NVIDIA Persistence Daemon
# Description:      Starts and stops the NVIDIA Persistence Daemon
### END INIT INFO

NVPD=nvidia-persistenced
NVPD_BIN=/usr/bin/${NVPD}
NVPD_RUNTIME=/var/run/${NVPD}
NVPD_PIDFILE=${NVPD_RUNTIME}/${NVPD}.pid
NVPD_USER=nvpd
NVPD_ACTION=${1}

# Gracefully exit if the package has been removed.
test -x $NVPD_BIN || exit 0

# Get the value of the PID
if [ -f ${NVPD_PIDFILE} ]; then
 read -r NVPD_PID < "${NVPD_PIDFILE}"
# Is the daemon already running?
 if [ "${NVPD_PID}" ] ;then 
  if [ -d /proc/${NVPD_PID} ]
# Daemon is running, so stop it then start anew instance
   then
    case "${1}" in
     start)
      echo "NVIDIA Persistence Daemon already running" 
      NVPD_ACTION=restart
      ;;
     *)
      ;;
    esac
# Daemon not running, but there is a stale PID
   else
    echo "NVIDIA Persistence Daemon, stale PID removed"			
    unset NVPD_PID
    rm -rf "${NVPD_RUNTIME}"
  fi
 fi
fi

case "${NVPD_ACTION}" in
 start)
  echo "Starting NVIDIA Persistence Daemon"
# Execute the daemon as the intended user
  ${NVPD_BIN} --user ${NVPD_USER}
  ;;
 stop)
   echo "Stopping NVIDIA Persistence Daemon"
# Stop the daemon - its PID should have been read in
   [ ! -z "${NVPD_PID}" ] && kill ${NVPD_PID} &> /dev/null
    ;;
  restart)
   $0 stop
   sleep 2
   $0 start
    ;;		
  *) echo "usage: $0 {start|stop|restart}"
    ;;
esac

exit 0

marjorie@erewhon:~$ sudo cat /var/log/dmesg | grep -i nvidia
[    1.251024] udevd[87]: Error running install command for nvidia
[    3.685958] nvidia: loading out-of-tree module taints kernel.
[    3.685972] nvidia: module license 'NVIDIA' taints kernel.
[    3.710764] nvidia-nvlink: Nvlink Core is being initialized, major device number 248
[    3.711615] NVRM: loading NVIDIA UNIX x86_64 Kernel Module  390.116  Sun Jan 27 07:21:36 PST 2019 (using threaded interrupts)
[    4.350801] input: HDA NVidia HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:02.0/0000:01:00.1/sound/card2/input13
[    4.351196] input: HDA NVidia HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:02.0/0000:01:00.1/sound/card2/input14
[    5.661013] nvidia-modeset: Loading NVIDIA Kernel Mode Setting Driver for UNIX platforms  390.116  Sun Jan 27 06:30:32 PST 2019
[    5.703206] [drm] [nvidia-drm] [GPU ID 0x00000100] Loading driver

DESCRIPTION
       The  nvidia-modprobe  utility  is  used  by user-space NVIDIA driver components to make sure the NVIDIA kernel module is loaded and that the NVIDIA
       character device files are present.  These facilities are normally provided by Linux distribution configuration systems such as udev.  When  possi‐
       ble,  it is recommended to use your Linux distribution's native mechanisms for managing kernel module loading and device file creation.  This util‐
       ity is provided as a fallback to work out-of-the-box in a distribution-independent way.

/media/marjorie/dc44c8b4-9d77-4ca3-9b39-1b0b352d7a80/var/log$ sudo cat ./dmesg | grep nvidia
[   16.201881] nvidia: loading out-of-tree module taints kernel.
[   16.201889] nvidia: module license 'NVIDIA' taints kernel.
[   16.239873] nvidia: module verification failed: signature and/or required key missing - tainting kernel
[   16.253093] nvidia-nvlink: Nvlink Core is being initialized, major device number 245
[   16.253816] NVRM: loading NVIDIA UNIX x86_64 Kernel Module  384.130  Wed Mar 21 03:37:26 PDT 2018 (using threaded interrupts)
[   16.260391] nvidia-modeset: Loading NVIDIA Kernel Mode Setting Driver for UNIX platforms  384.130  Wed Mar 21 02:59:49 PDT 2018
[   16.262006] [drm] [nvidia-drm] [GPU ID 0x00000100] Loading driver
[   16.529536] nvidia-uvm: Loaded the UVM driver in 8 mode, major device number 244
[   16.544189] systemd-udevd[979]: failed to execute '/bin/systemctl' '/bin/systemctl start --no-block nvidia-persistenced.service': No such file or directory
[   16.685718] input: HDA NVidia HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:02.0/0000:01:00.1/sound/card1/input13
[   16.685806] input: HDA NVidia HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:02.0/0000:01:00.1/sound/card1/input14
[   17.390018] systemd-udevd[1038]: failed to execute '/bin/systemctl' '/bin/systemctl stop --no-block nvidia-persistenced': No such file or directory