I was able to get around the below errors by deleting the user’s .x2go directory. Any reason why this continues to happen? We’re using the nightly builds. Here are some logs. Fails with MATE and XFCE.

rpm -q x2goserver x2goserver-4.1.0.0-0.0x2go1.0.git20171015.1421.heuler.fc26.x86_64

Unable to contact settings server Failed to connect to socket /run/user/xxxx/bus: Connection refused and the second was Unable to load a failsafesession Unsable to determine failsafe session name. Possible causes: xfconfd isn't running (D-Bus setup problem): environment variable $XDG_CONFIG_DIRS is set incorrectly (must include "etc'), or xfce4-session is installed incorrectly.

more .xsession-x2go-o <http://xsession-x2go-erdos.dsm.fordham.edu/>urdomain-errors XSession-x2go: X session started for localuser at Wed Oct 18 09:45:30 EDT 2017 Failed to connect to bus: Connection refused dbus-update-activation-environment: error: unable to connect to D-Bus: Failed to connect to socket /run/user/xxxx/bus: Connection refused

(imsettings-check:14190): IMSettings-WARNING **: Could not connect: Connection refused

(imsettings-check:14190): GLib-GIO-CRITICAL **: g_dbus_proxy_call_sync_internal: assertion 'G_IS_DBUS_PROXY (proxy)' failed mate-session[14003]: WARNING: Could not make bus activated clients aware of XDG_CURRENT_DESKTOP=MATE environment variable: Could not connect: Connection refused mate-session[14003]: WARNING: Could not make bus activated clients aware of DISPLAY=:184 environment variable: Could not connect: Connection refused mate-session[14003]: WARNING: Could not make bus activated clients aware of MATE_DESKTOP_SESSION_ID=this-is-deprecated environment variable: Could not connect: Connection refused mate-session[14003]: dconf-WARNING: failed to commit changes to dconf: Could not connect: Connection refused mate-session[14003]: WARNING: Could not make bus activated clients aware of SESSION_MANAGER=local/unix:@/tmp/.ICE-unix/14003,unix/unix:/tmp/.ICE-unix/14003 environment variable: Could not connect: Connection refused Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged. mate-session[14003]: Gtk-CRITICAL: gtk_main_quit: assertion 'main_loops != NULL' failed mate-session[14003]: CRITICAL: dbus_g_proxy_new_for_name: assertion 'connection != NULL' failed Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged. mate-session[14003]: Gtk-CRITICAL: gtk_main_quit: assertion 'main_loops != NULL' failed mate-session[14003]: GLib-GObject-CRITICAL: g_object_unref: assertion 'G_IS_OBJECT (object)' failed mate-session[14003]: WARNING: Could not make bus activated clients aware of GTK_OVERLAY_SCROLLING=0 environment variable: Could not connect: Connection refused mate-session[14003]: WARNING: keycode1 not existent mate-session[14003]: WARNING: keycode2 not existent mate-session[14003]: WARNING: GSIdleMonitor: IDLETIME counter not found mate-session[14003]: GLib-GObject-CRITICAL: object GSIdleMonitor 0x556fe2443c80 finalized while still in-construction mate-session[14003]: GLib-GObject-CRITICAL: Custom constructor for class GSIdleMonitor returned NULL (which is invalid). Please use GInitable instead. mate-session[14003]: CRITICAL: error getting session bus: Failed to connect to socket /run/user/xxxx/bus: Connection refused mate-session[14003]: WARNING: Unable to register presence with session bus mate-session[14003]: CRITICAL: dbus_g_proxy_new_for_name: assertion 'connection != NULL' failed mate-session[14003]: CRITICAL: error getting session bus: Failed to connect to socket /run/user/xxxx/bus: Connection refused