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 cannot go to login page and hang on the logo loading page forever. No matter how I try from now on, it always stops there. The only workaround I can find by the recovery 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
I want to be able to boot my Ubuntu properly but I can’t because it always stops at the logo page. I’m not sure how to debug this problem either, like check the log (this logo page doesn’t give any log) to figure out the reason.
So the problem is the logo page (Or so called splash page) itself. After disabling this page, everything works properly.
I resolved it by follow the @Kiwy 's comment and another posted thread: