Why Ubuntu Desktop 18 client to Windows 10 host clipboard doesn't work?

Question

UPDATE: after playing around, the issue is limited only to Chrome 81.0.4044.113 (Official Build) (64-bit) and Chromium 81.0.4044.113 (Official Build) snap (64-bit) (can paste text but can't copy text to the host). Working on Terminal, Files, Text Editor, Sublime Text,...

I'm a new Linux user, trying to find an alternative solution for my Windows desktop.

My issue: unable to use clipboard to copy from Ubuntu guest to Windows 10 host, while Windows 10 host to Ubuntu guest is working properly.

Below is my setup:

• Host: Windows 10. winver 1511 (OS build 10586.104)
• VM: VirtualBox 6.0.14 r133895 (Qt5.6.2) (I don't want to upgrade to newer version due to its another clipboard bug)
• Guests:
  • Windows 7, winver 6.1 (7601 SP1), all 4 Windows 7 boxes working flawlessly (clipboard host <--> guest)
  • Ubuntu 7 Desktop 18.04.4 LTS lsb_release -a

No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.4 LTS
Release:    18.04
Codename:   bionic

I have tried:

• Reboot
• Switch between VirtualBox clipboard sharing options
• Reinstall VirtualBox Guest Addition https://superuser.com/questions/1318231/why-doesnt-clipboard-sharing-work-with-ubuntu-18-04-lts-inside-virtualbox-5-1-2
• Install virtualbox-guest-x11 but same error in VirtualBox 6.1.4 - shared clipboard does not work Ubuntu 18.04

I have tried all solutions I could find in 3 days but no luck.

Answer 1

Based on suggestion Why Ubuntu Desktop 18 client to Windows 10 host clipboard doesn't work? I updated the VirtualBox to latest version 6.1.6 and it fixed the clipboard problem.