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I have set up Ubuntu 16.04 LTS (64bit) on Virtualbox (on Windows 8.1) for many days but this morning, while I was using Ubuntu, the computer became very slow and lag, the memory came up to 90% so I quickly shutdown the machine. After that, I started it again but there was an error.

I cannot login to that machine anymore. I can assure that this is not Virtualbox's errors because I can still login into another tty by using Ctrl + Alt + F1 => F6. But when I typed Ctrl + Alt + F7, it just appeared a dark screen, so I think that is GUI error. I have typed this command: `

sudo apt-get reinstall unity-desktop

but it said: 

Invalid operation reinstall

Does anyone know this error, please help me, thanks a lot.

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Sumeet Deshmukh
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Minh Andrew
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1 Answers1

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The following command worked for me.

sudo apt-get install --reinstall ubuntu-desktop
drmaa
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