Lubuntu - G_Is_Dbus_Connection

I have just installed Lubuntu on VM VirtrualBox.

When I run an app from terminal, eg. firefox, it works but terminal pops up some warnings.

maciex@maciex-pc:~$ firefox

(firefox:1152): Gtk-WARNING **: 16:15:43.300: Theme parsing error: <data>:1:34: Expected ')' in color definition

(firefox:1152): Gtk-WARNING **: 16:15:43.300: Theme parsing error: <data>:1:77: Expected ')' in color definition

(firefox:1152): GLib-GIO-CRITICAL **: 16:15:43.425: g_dbus_proxy_new: assertion 'G_IS_DBUS_CONNECTION (connection)' failed

(firefox:1152): GLib-GIO-CRITICAL **: 16:15:43.425: g_dbus_proxy_new: assertion 'G_IS_DBUS_CONNECTION (connection)' failed

(firefox:1152): GLib-GIO-CRITICAL **: 16:15:43.425: g_dbus_proxy_new: assertion 'G_IS_DBUS_CONNECTION (connection)' failed

(firefox:1152): GLib-GIO-CRITICAL **: 16:15:43.426: g_dbus_proxy_new: assertion 'G_IS_DBUS_CONNECTION (connection)' failed

(firefox:1152): GLib-GIO-CRITICAL **: 16:15:43.426: g_dbus_proxy_new: assertion 'G_IS_DBUS_CONNECTION (connection)' failed

It's not about firefox, the same issue with other apps. But if I start the same app not from terminal and then open terminal and run the same app from terminal - I do not have any warnings.

maciex@maciex-pc:~$ ps -u maciex
  PID TTY          TIME CMD
  829 ?        00:00:00 systemd
  840 ?        00:00:00 (sd-pam)
  865 ?        00:00:00 gnome-keyring-d
  868 ?        00:00:00 lxqt-session
  886 ?        00:00:00 dbus-daemon
  920 ?        00:00:00 ssh-agent
  950 ?        00:00:00 openbox
  953 ?        00:00:00 at-spi-bus-laun
  960 ?        00:00:00 agent
  964 ?        00:00:00 gvfsd
  969 ?        00:00:00 pcmanfm-qt
  970 ?        00:00:00 lxqt-globalkeys
  971 ?        00:00:00 lxqt-notificati
  972 ?        00:00:00 lxqt-panel
  973 ?        00:00:00 lxqt-policykit-
  974 ?        00:00:00 lxqt-runner
  976 ?        00:00:00 gvfsd-fuse
  979 ?        00:00:00 xscreensaver
  990 ?        00:00:00 dbus-daemon
  992 ?        00:00:00 applet.py
 1001 ?        00:00:00 pulseaudio
 1063 ?        00:00:00 gvfsd-trash
 1069 ?        00:00:00 gvfs-udisks2-vo
 1086 ?        00:00:00 gvfs-goa-volume
 1092 ?        00:00:00 gvfs-gphoto2-vo
 1101 ?        00:00:00 gvfs-mtp-volume
 1105 ?        00:00:00 gvfs-afc-volume
 1119 ?        00:00:00 lxqt-powermanag
 1121 ?        00:00:00 qlipper
 1123 ?        00:00:00 nm-tray
 1131 ?        00:00:00 qterminal
 1134 pts/0    00:00:00 bash
 1142 pts/0    00:00:00 ps

Could someone explain it? How to solve it?

Thanks