Changing gnome settings in Ubuntu 16.04 from command line

You can get a list of schemas with:

gsettings list-schemas
org.gnome.rhythmbox.library
org.gnome.shell.overrides
org.gnome.system.proxy.https
org.nemo.preferences
org.gnome.settings-daemon.plugins.cursor
org.gnome.evolution.shell
org.gnome.evolution.plugin.face-picture
com.ubuntu.update-manager
org.gnome.shell.extensions.auto-move-windows
org.gnome.eog.fullscreen
org.gnome.login-screen
org.gnome.eog.view
org.gnome.evolution-data-server.calendar
org.gnome.evolution.plugin.itip
org.gnome.evolution.plugin.autocontacts
org.gnome.evolution.plugin.attachment-reminder
com.canonical.a11y-profile-manager
org.gnome.libgnomekbd
org.gnome.rhythmbox.plugins.mtpdevice
org.gnome.desktop.search-providers
org.gnome.evolution.shell.network-config
org.gnome.Logs
org.gnome.rhythmbox.player
org.gnome.calculator
org.gnome.settings-daemon.plugins.a11y-settings
org.gnome.DejaDup.Rackspace
org.gnome.system.smb
org.gnome.desktop.media-handling
org.gnome.software
org.gnome.settings-daemon.plugins.smartcard
org.freedesktop.Telepathy.Logger
org.gnome.desktop.default-applications
org.gnome.nm-applet
org.gnome.settings-daemon.peripherals.keyboard
org.gnome.gnome-system-log
org.gnome.evolution
org.gnome.settings-daemon.plugins
org.gnome.Terminal.ProfilesList
org.gnome.shell.app-switcher
com.canonical.unity-gtk-module
org.freedesktop.Tracker
org.gnome.Contacts
org.gnome.gedit.state
org.gnome.gedit.preferences.ui
org.gnome.rhythmbox.plugins.magnatune
org.gnome.documents
org.gnome.FileRoller.Dialogs.New
org.gnome.gedit.plugins
org.gnome.settings-daemon.plugins.gsdwacom
org.gnome.desktop.a11y.mouse
org.gtk.Settings.Debug
org.gnome.shell.extensions.screenshot-window-sizer
org.gnome.desktop.wm.preferences
org.gnome.seahorse.recipients
org.gnome.gedit.state.history-entry
org.gnome.online-accounts
org.gnome.mutter.keybindings
org.gnome.settings-daemon.plugins.xsettings
org.gnome.FileRoller.Dialogs.LastOutput
org.gnome.Empathy.conversation
org.gnome.nautilus.window-state
org.gnome.gedit.plugins.terminal
org.gnome.yelp
org.gnome.libgnomekbd.keyboard
org.gnome.gnome-screenshot
org.nemo.privacy
org.gnome.DejaDup.GDrive
org.gnome.evolution.plugin.prefer-plain
org.gnome.shell.window-switcher
com.ubuntu.notifications.hub
org.gnome.seahorse
org.gnome.settings-daemon.plugins.media-keys
org.gnome.totem.plugins.opensubtitles
org.gnome.Empathy.sounds
org.gnome.settings-daemon.plugins.color
org.gnome.evolution-data-server
org.gnome.totem
org.gnome.baobab.preferences
org.nemo.icon-view
org.gnome.FileRoller.Dialogs.Add
org.gnome.settings-daemon.plugins.gdu-sd
org.gnome.evolution.plugin.publish-calendar
org.freedesktop.ibus.general.xkblayoutconfig
org.gnome.settings-daemon.plugins.xrandr
org.gnome.baobab.ui
org.gnome.shell.extensions.classic-overrides
org.gnome.desktop.a11y.keyboard
org.gnome.settings-daemon.plugins.orientation
org.gnome.desktop.a11y
org.gnome.system.proxy.socks
org.gnome.desktop.interface
org.freedesktop.Tracker.FTS
org.gnome.system.proxy
org.gnome.mousetweaks
org.gnome.gedit.preferences
org.gnome.desktop.lockdown
org.gnome.settings-daemon.plugins.housekeeping
org.gnome.Empathy.notifications
org.gnome.desktop.a11y.applications
org.gnome.mutter.wayland.keybindings
org.gnome.rhythmbox.sources
org.gnome.settings-daemon.plugins.rfkill
org.gnome.gedit.preferences.print
org.gnome.evolution.spamassassin
org.freedesktop.Tracker.Miner.Files
org.gnome.Maps
org.gnome.settings-daemon.plugins.datetime
org.nemo.sidebar-panels.tree
org.gnome.Evince.Default
org.gnome.rhythmbox
org.gnome.settings-daemon.plugins.clipboard
org.gnome.libgnomekbd.preview
org.gnome.desktop.default-applications.office.calendar
org.gnome.mines
org.gnome.shell
org.gnome.Empathy.hints
org.gnome.Terminal.Legacy.Settings
org.gnome.brasero.config
org.gnome.desktop.screensaver
org.gnome.eog.plugins
org.gnome.system.locale
org.gnome.settings-daemon.plugins.updates
org.gnome.desktop.wm.keybindings
org.gnome.eog
org.gnome.system.proxy.ftp
org.gnome.evolution.addressbook
org.gnome.sudoku
org.gnome.gedit
org.gnome.Disks
org.freedesktop.Tracker.DB
apps.nautilus-pastebin
org.freedesktop.Tracker.Needle
org.gnome.evolution.bogofilter
org.gnome.mutter
org.freedesktop.folks
org.gnome.gedit.preferences.encodings
org.gnome.evolution.importer
org.gnome.FileRoller.Listing
org.freedesktop.Tracker.Writeback
org.gnome.gnome-system-monitor
org.gnome.system.proxy.http
org.gnome.SessionManager
org.gnome.gedit.state.window
org.nemo.desktop
org.nemo.list-view
org.gnome.desktop.background
org.freedesktop.ibus.general
org.gnome.Evince
org.gnome.Empathy.ui
org.gnome.baobab
org.gnome.evolution.calendar
org.gnome.brasero
org.gnome.settings-daemon.peripherals
org.gnome.desktop.peripherals
com.ubuntu.user-interface
ca.desrt.dconf-editor.Settings
com.canonical.indicator.sound
org.gnome.desktop.notifications
org.gnome.gedit.plugins.time
org.gnome.gedit.plugins.filebrowser.nautilus
org.gnome.Empathy.location
org.gnome.Charmap
org.gnome.FileRoller
org.gnome.Weather.Application
org.gnome.Cheese
org.gnome.gedit.plugins.filebrowser
com.ubuntu.sound
org.gnome.desktop.peripherals.mouse
org.gnome.crypto.pgp
org.gnome.FileRoller.General
org.gnome.GWeather
org.gnome.settings-daemon.plugins.screensaver-proxy
org.gnome.desktop.default-applications.office.tasks
org.gnome.Empathy.call
org.gnome.books
org.gnome.desktop.app-folders
org.gnome.gedit.preferences.editor
org.gnome.settings-daemon.peripherals.smartcard
org.gnome.gnome-system-monitor.openfilestree
org.gnome.nautilus.list-view
org.gnome.SimpleScan
org.gnome.nautilus.icon-view
org.nemo.compact-view
org.gnome.rhythmbox.plugins.iradio
org.gnome.desktop.peripherals.touchpad
org.gnome.gnome-system-monitor.memmapstree
org.gnome.DejaDup.File
org.gnome.Music
org.gnome.seahorse.manager
org.gnome.evolution.plugin.external-editor
org.gtk.Settings.FileChooser
com.ubuntu.touch.sound
org.gnome.DejaDup.S3
org.gnome.settings-daemon.plugins.remote-display
org.gnome.shell.keyboard
org.gnome.libgnomekbd.desktop
org.gnome.shell.extensions.user-theme
org.gnome.calendar
org.gnome.gedit.state.file-filter
org.gnome.mahjongg
org.gnome.shell.calendar
org.gnome.settings-daemon.plugins.background
org.freedesktop.Tracker.Miner
org.gnome.settings-daemon.plugins.a11y-keyboard
org.gnome.Charmap.WindowState
org.gnome.telepathy-account-widgets.ui
org.gnome.rhythmbox.plugins.visualizer
org.gnome.settings-daemon.peripherals.input-devices
org.freedesktop.Tracker.Store
org.gtk.Settings.ColorChooser
org.gnome.desktop.privacy
org.gnome.system.dns_sd
org.freedesktop.ColorHelper
org.gnome.rhythmbox.plugins.grilo
org.gnome.desktop.a11y.magnifier
org.gnome.seahorse.nautilus
org.gnome.rhythmbox.plugins.replaygain
org.gnome.rhythmbox.plugins.ipod
org.gnome.rhythmbox.plugins.daap
org.gnome.desktop.default-applications.office
org.gnome.rhythmbox.rhythmdb
org.gnome.desktop.sound
org.gnome.evolution.mail
org.gnome.desktop.datetime
org.gnome.Vino
com.ubuntu.touch.network
org.gnome.rhythmbox.podcast
org.gnome.evolution-data-server.addressbook
org.gnome.evolution.plugin.templates
org.gnome.evolution.plugin.mail-notification
org.gnome.desktop.peripherals.keyboard
org.gnome.settings-daemon.plugins.mouse
org.gnome.settings-daemon.plugins.sharing
org.gnome.crypto.cache
org.gnome.rhythmbox.plugins.audiocd
org.gnome.gedit.plugins.pythonconsole
org.freedesktop.ibus.panel
org.gnome.photos
com.ubuntu.phone
com.ubuntu.touch.system
org.gnome.FileRoller.UI
org.gnome.FileRoller.Dialogs.Extract
org.gnome.FileRoller.Dialogs
org.gnome.desktop.input-sources
org.gnome.Evolution.DefaultSources
org.gnome.desktop.default-applications.terminal
org.gnome.eog.ui
org.gnome.rhythmbox.plugins.android
org.gnome.system.location
org.gnome.rhythmbox.plugins
org.gnome.shell.keybindings
org.nemo.sidebar-panels
org.gnome.libgnomekbd.indicator
org.gnome.FileRoller.FileSelector
org.gnome.settings-daemon.plugins.sound
org.gnome.settings-daemon.plugins.power
apps.gtkhash
apps.gtkhash-properties
org.nemo.window-state
com.canonical.indicator.appmenu
org.gnome.settings-daemon.plugins.keyboard
org.nemo.plugins
org.freedesktop.ibus
org.gnome.rhythmbox.sharing
org.gnome.brasero.display
org.nemo
org.gnome.desktop.session
org.gnome.settings-daemon.peripherals.touchscreen
org.freedesktop.gstreamer-0.10.default-elements
org.gnome.gnome-system-monitor.proctree
com.ubuntu.update-notifier
org.gnome.nautilus
org.gnome.desktop.peripherals.trackball
org.gnome.meld
org.gnome.evolution.eds-shell
org.freedesktop.ibus.general.hotkey
org.gnome.desktop.thumbnail-cache
org.gnome.desktop.thumbnailers
com.canonical.Unity.Lenses
org.gnome.gedit.plugins.externaltools
org.gnome.nautilus.preferences
org.gnome.gnome-system-monitor.disktreenew
im.telepathy.MissionControl.FromEmpathy
org.gnome.brasero.filter
com.canonical.indicator.messages
org.gnome.DejaDup.OpenStack
org.gnome.gedit.plugins.drawspaces
org.freedesktop.Geoclue
org.gnome.desktop.file-sharing
org.gnome.shell.extensions.native-window-placement
org.gnome.DejaDup.GCS
org.gnome.DejaDup
org.gnome.rhythmbox.plugins.lyrics
org.gnome.settings-daemon.peripherals.mouse
org.gnome.rhythmbox.plugins.generic-player
org.gnome.evolution.plugin.email-custom-header
org.gnome.gedit.plugins.wordcompletion
org.freedesktop.Tracker.Extract
org.gnome.shell.extensions.window-list
org.gnome.settings-daemon.plugins.print-notifications
org.gnome.totem.plugins.pythonconsole
org.gnome.Empathy
org.gnome.nautilus.desktop