Menubar is Missing

[prana]

Hi,

I've installed Kubuntu 17.10 desktop on my Ubuntu 17.10 in Virtualbox.

The Kubuntu boot splash screen is coming and I'm able to boot into plasma.

But once the desktop appears, the bottom K-App launcher and the notification bar appears briefly and once clicked then gone missing.
After a little, it freezes completely.

Appreciate if some can help me to resolve the issue.

Thanks.

[prana]

My system information from windows are as follows:

-----------------
System Information
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Time of this report: 11/3/2017, 13:10:56

Operating System: Windows 10 Pro 64-bit (10.0, Build 15063) (15063.rs2_release.170317-1834)
Language: English (Regional Setting: English)
System Manufacturer: Micro-Star International Co., Ltd.
System Model: GE62VR 7RF
BIOS: E16JBIMS.310
Processor: Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz (8 CPUs), ~2.8GHz
Memory: 16384MB RAM
Available OS Memory: 16270MB RAM
Page File: 14256MB used, 4445MB available

---------------
Display Devices
---------------
Card name: Intel(R) HD Graphics 630
Manufacturer: Intel Corporation
Chip type: Intel(R) HD Graphics Family
DAC type: Internal
Device Type: Full Device
Device Key: Enum\PCI\VEN_8086&DEV_591B&SUBSYS_11D51462&REV_04
Device Status: 0180200A [DN_DRIVER_LOADED|DN_STARTED|DN_DISABLEABLE|DN_NT_E NUMERATOR|DN_NT_DRIVER]
Device Problem Code: No Problem
Driver Problem Code: Unknown
Display Memory: 8262 MB
Dedicated Memory: 128 MB
Shared Memory: 8134 MB
Current Mode: 1920 x 1080 (32 bit) (60Hz)
Monitor Name: Generic PnP Monitor
Monitor Model: unknown

Card name: NVIDIA GeForce GTX 1060
Manufacturer: NVIDIA
Chip type: GeForce GTX 1060
DAC type: Integrated RAMDAC
Device Type: Full Device
Device Key: Enum\PCI\VEN_10DE&DEV_1C20&SUBSYS_11D51462&REV_A1
Device Status: 0180200A [DN_DRIVER_LOADED|DN_STARTED|DN_DISABLEABLE|DN_NT_E NUMERATOR|DN_NT_DRIVER]
Device Problem Code: No Problem
Driver Problem Code: Unknown
Display Memory: 14180 MB
Dedicated Memory: 6046 MB
Shared Memory: 8134 MB