id summary reporter owner description type status component version resolution keywords cc guest host 10407 version 4.1.12 fails with ubuntu vm initialization djazz44 version 4.1.10 worked perfectly with 4 installed vms (2 Win8, 1 DOS, 1 Ubuntu 11.10). Today I installed version 4.1.12. Everything worked until I tried Ubuntu. When starting, all USB devices became unavailable in the host system (Win7 64K Pro). Using a PS/2 mouse, I was able to use Task Manager to kill the Ubuntu process. I also had to kill the Virtual Box Manager because it no longer responded. After Virtual Box Manager was killed. The USB devices returned to normal operation. defect closed other VirtualBox 4.1.12 obsolete Linux Windows