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I've installed virtualbox-5.0 successfully on ubuntu 16.04. During installation I didn't get any error message, but now I can't launch it. I had enabled hardware virtualization technology (VT-x) for use in Virtualbox befor installation and also I test two installation way : using ubuntu repository and downloading .deb (following this link)

here is the screen shot of launching result that system does nothing.

I don't know why and what should I do.

The output of /usr/lib/nux/unity_support_test -p command is here: result of unity support test command

Update (OCT24):

When I edit grub config file (/etc/default/grub) to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset" and update grub, Virtualbox appears and launches, but system runs very very slow that I can't even click on something properly.

Any help would be appreciated.

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  • 1
    Reboot of host and not running VirtualBox as root may help.
    – Takkat
    Sep 13, 2017 at 7:44
  • 1
    Can you post the output for the command virtualbox in the terminal?
    – AmeyaVS
    Sep 13, 2017 at 7:44
  • 2
    no, you didn't you are still root.
    – Takkat
    Sep 13, 2017 at 9:36
  • 1
    @FatemehAbdollahei Reinstall vbox ?
    – Liso
    Oct 24, 2017 at 8:43
  • 1
    @FatemehAbdollahei But no window? Has it opened on another "imaginary" secondary screen or something?
    – Tim
    Oct 26, 2017 at 17:28

1 Answer 1

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From what you’ve said, it sounds like VirtualBox is open.

Sometimes, especially on laptops, you can get a “phantom” screen - when Ubuntu thinks there’s a screen connected to the HDMI output (or equivalent) when there’s nothing there.

Ubuntu may still try to display applications on this phantom screen. Try disabling the external screen to avoid this issue. When you do disable it, all of the applications on that screen should move to the only screen connected - the real screen.

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