Desktop environment [X]

Xfce

Processes

With pstree, I find the following, imho, interesting processes:

systemd-+-…
        |-dbus-daemon
        |-lightdm-+-Xorg---22*[{Xorg}]
        |         |-lightdm-+-xfce4-session-+-Thunar---2*[{Thunar}]
        |         |         |               |-firefox-esr-+-Isolated Servic---21*[{Isolated Servic}]
        |         |         |               |             `-…
        |         |         |               |-kdeconnectd---5*[{kdeconnectd}]
        |         |         |               |-light-locker---3*[{light-locker}]
        |         |         |               |-nm-applet---3*[{nm-applet}]
        |         |         |               |-polkit-gnome-au---2*[{polkit-gnome-au}]
        |         |         |               |-ssh-agent
        |         |         |               |-xfce4-panel-+-panel-10-notifi---2*[{panel-10-notifi}]
        |         |         |               |             |-panel-14-action---2*[{panel-14-action}]
        |         |         |               |             |-panel-6-systray---2*[{panel-6-systray}]
        |         |         |               |             |-panel-8-pulseau---2*[{panel-8-pulseau}]
        |         |         |               |             |-panel-9-power-m---2*[{panel-9-power-m}]
        |         |         |               |             `-2*[{xfce4-panel}]
        |         |         |               |-xfce4-power-man---2*[{xfce4-power-man}]
        |         |         |               |-xfdesktop---2*[{xfdesktop}]
        |         |         |               |-xfsettingsd---2*[{xfsettingsd}]
        |         |         |               |-xfwm4---12*[{xfwm4}]
        |         |         |               |-xiccd---2*[{xiccd}]
        |         |         |               `-2*[{xfce4-session}]
        |         |         `-2*[{lightdm}]
        |         `-2*[{lightdm}]
        `-xfce4-terminal-+-bash---…
                         |-bash---pstree
                         `-2*[{xfce4-terminal}]

Executables

`xfce4-about`
`xfce4-accessibility-settings`
`xfce4-appearance-settings`
`xfce4-appfinder`
`xfce4-clipman`
`xfce4-clipman-history`
`xfce4-clipman-settings`
`xfce4-color-settings`
`xfce4-dict`
`xfce4-display-settings`
`xfce4-find-cursor`
`xfce4-keyboard-settings`
`xfce4-mime-helper`
`xfce4-mime-settings`
`xfce4-mouse-settings`
`xfce4-notifyd-config`
`xfce4-panel`
`xfce4-popup-applicationsmenu`
`xfce4-popup-clipman`
`xfce4-popup-clipman-actions`	A symlink to `xfce4-popup-clipman`
`xfce4-popup-directorymenu`
`xfce4-popup-places`
`xfce4-popup-whiskermenu`
`xfce4-popup-windowmenu`
`xfce4-power-manager`
`xfce4-power-manager-settings`
`xfce4-screenshooter`
`xfce4-sensors`
`xfce4-session`
`xfce4-session-logout`
`xfce4-session-settings`
`xfce4-settings-editor`
`xfce4-settings-manager`
`xfce4-taskmanager`
`xfce4-terminal`
`xfce4-terminal.wrapper`
`xfwm4`	The window manager for the Xfce Desktop Environment: it places windows on the screen, provides decorations for the windows and allows them to be moved, resized or closed.
`startxfce4`	A shell script that seems to start xfce4.
`xfdesktop`	The desktop manager for the Xfce 4 Desktop Environment

xfwm4

xfwm4 not started

Why is xfwm4 on my broken not started.

$ ps -C xfwm4

Removing ~/.cache/sessions and then restarting the computer did not help.

Trying to start it as follows didn't help either:

$ xfwm4 --replace

However, I was able to start it manually with

$ xfwm4 --compositor=off

lightdm

Starting lightdm can be disabled. When doing so, after the next login, one will land on a TTY

$ sudo systemctl disable lightdm.service
$ sudo systemctl stop lightdm.service

Enable and start lightdm:

$ sudo systemctl enable lightdm.service
$ sudo systemctl start lightdm.service