i am trying to install ubuntu 15.04 on virtualbox. The first time it was established without problems, but now i can not install it again. When i start the machine this error occurs:
And after installing the optical disk drive disappears from VM and when i start the VM again i offer to install it again.
Please, help me fix this problem, I urgently need this VM for work.
The warning you see on booting Ubuntu in a Virtual Machine is just to tell you, that in this virtualized environment there is no System Management Bus. This of course is expected, as we do not install on bare metal. We can safely ignore this warning.
After installing Ubuntu from the .ISO file we have to remove this virtual CD-ROM from the virtual machine to be able to boot from the virtual hard drive (.VDI) we had created. Otherwise it will just boot again from the CD image which will offer you to re-install (see e.g. my answer here).
