Ubuntu 18.04 in Virtualbox 5.2.12 wan't boot

2018-06-24 18:28:55

In my windows 7, I've installed the VirtualBox 5.2.12. Then the Ubuntu 18.04 is installed. The first several times rebooting work properly. But suddenly from one time of the rebooting, The Ubuntu can not go to login page and hanging on the logo loading page forever. No matter how I try from now on, it always stops there.

The only work around I can find is go into the recover mode which works properly except I can't modify the screen resolution.

I've configured my virtual box to use maximum video memory which is 128MB and check the Enable 3D Acceleration. As well, the memory is 11GB and CPU is 4