Problem with lubuntu 19.10 and vnc

I’ve recently installed lubuntu 19.10 on a Zotac Zbox ND01 (Intel Atom with Nvidia ION and installed Nvidia binary drivers).

Installation of lubuntu and tightvnc (had problems getting x11vnc running) worked fine - except after connection via vnc there is no taskbar via VNC, but a gray bar.

Installed tightvnc with the tutorial: https://www.fosslinux.com/17674/how-to-install-vnc-server-on-ubuntu.htm (except the startxfce4 in .vnc/xstartup of course which i replaced with startlxqt)

resulting in: Desktop of theVNC-Connection with missing menubar in the VNC-Log the is following:

27/11/19 22:50:17 Xvnc version TightVNC-1.3.10
27/11/19 22:50:17 Copyright (C) 2000-2009 TightVNC Group
27/11/19 22:50:17 Copyright (C) 1999 AT&T Laboratories Cambridge
27/11/19 22:50:17 All Rights Reserved.
27/11/19 22:50:17 See http://www.tightvnc.com/ for information on TightVNC
27/11/19 22:50:17 Desktop name 'X' (dls:1)
27/11/19 22:50:17 Protocol versions supported: 3.3, 3.7, 3.8, 3.7t, 3.8t
27/11/19 22:50:17 Listening for VNC connections on TCP port 5901
Font directory '/usr/share/fonts/X11/75dpi/' not found - ignoring
Font directory '/usr/share/fonts/X11/100dpi/' not found - ignoring
qt.qpa.xcb: XKeyboard extension not present on the X server
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-dl'
!: 1: Syntax error: Unterminated quoted string
--load-config-only': 1: Syntax error: Unterminated quoted string
Xlib:  extension "GLX" missing on display ":1".
Verbindungsfehler: Verbindung verweigert
pa_context_new() fehlgeschlagen: Verbindung verweigert
dbus-daemon[22391]: Activating service name='org.a11y.atspi.Registry' requested by ':1.0' (uid=1000 pid=22408 comm="/usr/bin/nm-applet " label="unconfined")
dbus-daemon[22391]: Successfully activated service 'org.a11y.atspi.Registry'
SpiRegistry daemon is running with well-known name - org.a11y.atspi.Registry

(nm-applet:22408): Gtk-WARNING **: 22:50:22.383: Can't set a parent on widget which has a parent
qt.qpa.xcb: XKeyboard extension not present on the X server
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-dl'
qt.qpa.xcb: XKeyboard extension not present on the X server
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-dl'
(0x7ffed66977a0) Debug: systemd: "CanReboot" = "challenge"
An instance of qlipper is already running!
(0x7ffed66977a0) Debug: systemd: "CanPowerOff" = "challenge"
QSystemTrayIcon::setVisible: No Icon set

27/11/19 22:50:24 Got connection from client 192.168.1.245
27/11/19 22:50:24 Using protocol version 3.8
27/11/19 22:50:24 Full-control authentication passed by 192.168.1.245
27/11/19 22:50:24 Pixel format for client 192.168.1.245:
27/11/19 22:50:24   16 bpp, depth 15, little endian
27/11/19 22:50:24   true colour: max r 31 g 31 b 31, shift r 10 g 5 b 0
27/11/19 22:50:24 Using tight encoding for client 192.168.1.245
27/11/19 22:50:24 rfbProcessClientNormalMessage: ignoring unknown encoding 16
27/11/19 22:50:24 rfbProcessClientNormalMessage: ignoring unknown encoding 9
27/11/19 22:50:24 rfbProcessClientNormalMessage: ignoring unknown encoding -65527
27/11/19 22:50:24 Using compression level 3 for client 192.168.1.245
27/11/19 22:50:24 Using image quality level 7 for client 192.168.1.245
27/11/19 22:50:24 Enabling X-style cursor updates for client 192.168.1.245
27/11/19 22:50:24 Enabling cursor position updates for client 192.168.1.245
27/11/19 22:50:24 rfbProcessClientNormalMessage: ignoring unknown encoding -131072
27/11/19 22:50:24 rfbProcessClientNormalMessage: ignoring unknown encoding -223
27/11/19 22:50:24 Enabling LastRect protocol extension for client 192.168.1.245
27/11/19 22:50:24 rfbProcessClientNormalMessage: ignoring unknown encoding -131071
27/11/19 22:50:24 rfbProcessClientNormalMessage: ignoring unknown encoding -131070
27/11/19 22:50:24 rfbProcessClientNormalMessage: ignoring unknown encoding -131069
27/11/19 22:50:24 rfbProcessClientNormalMessage: ignoring unknown encoding -309

i’ve seared and tried a lot, but nothing worked - or was usable with the new lxqt

any ideas? any other logs to provide?

thanks in advance