mjhjmtu

I have a Debian 8.10 Jessie installed on my laptop and since this morning, my environnment behaviour is completely broken : ALT+TAB doesn't work, ALT+F4 doesn't work, I can't move, close or adjust the size of my application (So I just can't close my Firefox window), right clicking on my firefox don't work, I can't see my top bar with my apps and system options.

I tried (from this) with no success with startx not working:

sudo apt-get update
sudo apt-get upgrade #see if the package is held back
sudo apt-get purge gnome-session
sudo apt-get install gnome-session
startx

I also tried sudo apt-get dist-upgrade and apt-get install gnome-accessibility-themes and rebooting multiple times but nothing works.
I found sudo apt-get install compizconfig-settings-manager but I have an error of package not found despite having non-free indicated in my /etc/apt/sources.list

I'm out of solutions here :(

.xinitrc :

#!/bin/sh# /etc/X11/xinit/xinitrc
## global xinitrc file, used by all X sessions started by xinit (startx)
# invoke global X session script.
/etc/X11/Xsession

.xseesion-errors (I remove a lot of files errors output cause it would have made a very long message ):

 Xsession: X session started for charles at samedi 10 février 2018, 17:21:17 (UTC+0100)
localuser:charles being added to access control list
openConnection: connect: Aucun fichier ou dossier de ce type
cannot connect to brltty at :0
/usr/bin/x-session-manager: X server already running on display :0
xfce4-session-Message: ssh-agent is already running; starting gpg-agent without ssh support
xfce4-panel: No window manager registered on screen 0. To start the panel without this check, run with --disable-wm-check.
xfsettingsd: No window manager registered on screen 0.

(xfsettingsd:1773): xfsettingsd-WARNING **: Failed to get the _NET_NUMBER_OF_DESKTOPS property.

(xfce4-session:1761): Wnck-CRITICAL **: wnck_workspace_activate: assertion 'WNCK_IS_WORKSPACE (space)' failed

(zeitgeist-datahub:1966): GLib-GObject-WARNING **: invalid (NULL) pointer instance

(zeitgeist-datahub:1966): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed

** (terminator:1774): WARNING **: Binding '<Shift><Control><Alt>a' failed!
Unable to bind hide_window key, another instance/window has it.
nm-applet-Message: No keyring secrets found for ABOX/802-11-wireless-security; asking user.

** (terminator:1775): WARNING **: Binding '<Shift><Control><Alt>a' failed!
Unable to bind hide_window key, another instance/window has it.

--------- A lot of error messages -----------

(/opt/firefox/firefox:3600): GLib-GObject-CRITICAL **: g_object_unref: assertion 'object->ref_count > 0' failed

** (terminator:3706): WARNING **: Binding '<Shift><Control><Alt>a' failed!
Unable to bind hide_window key, another instance/window has it.

These error messages makes me believe that the XFCE window manager (usually xfwm4) was not properly started:

xfce4-panel: No window manager registered on screen 0. To start the panel without this check, run with --disable-wm-check.
xfsettingsd: No window manager registered on screen 0.

The window manager is the utility that puts decorations on windows and allows you to interact with them (moving them around etc.).

Usually, the XFCE desktop environment should be started from either ~/.xsession or ~/.xinitrc using the command startxfce4.

For whatever reason, I have the command

exec ck-launch-session startxfce4

in my own .xinitrc. The ck-launch-session is a utility "to start a ConsoleKit session from a shell script", and exec replaces the current process with that utility. If you don't use ConsoleKit, then simply remove ck-launch-session from that line (I believe I needed to include that to be able to shut down and to reboot from the XFCE menus).

I'm not on Debian (or Linux at all), so I can't say that this would definitely be the correct solution to your issue.