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I've been running Ubuntu 18.04 on VirtualBox for 5 months now, with no problems.

Today, I've encountered a quite annoying problem, to be honest. After I log in, the screen goes black with no reaction from mouse or keyboard input.

After a while though, the login screen reappears, but if I log in again the same thing happens, over and over again. I've already increased my Video memory in settings but that doesn't help.

Also, I wonder why this is happening now, although it never happened in the previous 5 months. Note that I only use this virtual machine for school stuff.

3 Answers 3

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When using VirtualBox with Ubuntu 18.04 I have to leave full screen (Ctrl + F) and reduce VirtualBox display windows by dragging it to a lower size for Ubutnu system to boot an activate view on login window. Playing with screen size often allows me to overcome unresponsive cases.

Once login is complete I use fullscreen again and it works. I have a dual screen setup on a laptop under windows 7 with older VirtualBox 5.2.20, this is behaving this way for a while now.

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I had a similar issue (black screen after login) that I fixed by :

  • Downloading and installing the lastest version of VirtualBox from Oracle website
  • Configuring the graphic controler to VBoxVGA and increasing memory video to 96 Mo.

I hope this will help someome.

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Happened to me after updating latest version of "Xubuntu" as part of The Odin Project. for Window users>I am using a Windows 10 OS and if you click the black screen, simply press FN+F8 and you will see the cursor re-appear (no need to reboot)

  1. The issue happened when I clicked the black screen that would normally boot up and have the GUI we are used to seeing.
  2. I clicked View>Virtual Screen1>then Scale to 100% (click OK for the warning about Host+Ctrl) 3.Then I closed the window by clicking the top-right X in the window
  3. IMPORTATNT, DO NOT 'Save the machine state' >this was causing me to get the loop over and over.
  4. Then restart and it SHOULD start anew.

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