In the end of this issue https://forums.whonix.org/t/virtualbox-6-1-whonix-15-aborted/9178 I decided to return to virtualbox v5.2 and try to solve clipboard problem and I found out several mistakes.
If I try to import VM from Whonix-XFCE-184.108.40.206.4 distribute I get this screen when I try to start VM
at the same time If I try to import VM from Whonix-XFCE-220.127.116.11.9 distribute everything goes well and moreover clipboard works fine. Far more I have VM which I upgrated from Kernel v.18.104.22.168 (Whonix-XFCE-22.214.171.124.9 distribute) to Kernel v.126.96.36.199 (Whonix-XFCE-188.8.131.52.4 distribute) and of course clipboard doesn’t work. If I try to boot from Kernel v.184.108.40.206 in this VM I stuck in this screen .
Something exactly goes wrong.
You should pay attention that import and clipboard works fine with VirtulBox 6.1 but there I faced with another so annoying problem which can’t allow to work normal - ABORTED!!
Could somebody help me to solve this problems?