What is ubuntu 14.04 doing while showing "stopping early crypto disks"?
Solution 1:
The OP solved their problem and explained how in a comment:
I figured it out. When I installed it, I set the first boot media as CD-ROM. After installation, I must change it to HardDisk. The strange is that in previous cases, VirtualBox did it automatically. I used VirtualBox to install and use ubuntu several times successfully. I don't remember I changed boot priority by myself before. Anyway, it works now.
– Stan Huang at Taiwan Jun 27 at 7:38