host: Windows 10 with all the latest updates
guest: Ubuntu 18.04
VirtualBox 5.2.12
- Ubuntu 18.04 VirtualBox Machine: 4GiB, 2CPUs, VT-x/AMD-V, Nested Paging,PAE/Nx, Video memory 56 MB
- I installed Ubuntu 18.04 from ubuntu-18.04-desktop-amd64.iso.
- Did reboot: boots fine.
- Installed all the latest updates for Ubuntu.
- Tried to reboot: it hangs.
Tried to increase Virtual Machine's memory, the number of processors – nothing helped.
My another VB Machine is Ubuntu 16.04 with all the latest updates and it runs fine.
Best Answer
I followed the advice given at this thread forums.virtualbox.org