0

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.

Below is some images:

enter image description here

enter image description here

Sumeet Deshmukh
  • 8,866
Minh Andrew
  • 11
  • What was the error message that you saw? – heynnema Mar 06 '17 at 17:27
  • @heynnema As mentioned above, it just appeared "Invalid operation reinstall" when I typed sudo apt-get reinstall unity-desktop and entered. I will add some images on the topic. – Minh Andrew Mar 06 '17 at 22:45
  • The command should be --reinstall not reinstall – Ege Sucu Mar 06 '17 at 22:51
  • Possible duplicate of How do I reinstall Unity? – Ege Sucu Mar 06 '17 at 22:54
  • 1
    @Egrimo Oops ! This error has happened again. But this time, I don't know what is the reason like before (the reason is shutdown incorrectly). And I have tried these commands but they didn't matter: sudo apt-get update sudo apt-get install --reinstall ubuntu-desktop sudo apt-get install unity Please help me, thanks a lot. Notice that I can't set up Ubuntu again because there're a lot of important data on it !! – Minh Andrew Mar 21 '17 at 09:30
  • @MinhAndrew Can you login and desktop doesn't seen or you're in login-loop ? – Ege Sucu Mar 21 '17 at 10:48
  • @Egrimo No, it's not a login-loop error. Because I turned off the password-asking when start so it isn't ask me. It just appears Ubuntu start screen and then is a black screen.And i think desktop doesn't seen. – Minh Andrew Mar 21 '17 at 14:03
  • @MinhAndrew After seeing black screen can you reach Terminal ? If you do, you can try this command(maybe unity isnt enabled by default) sudo apt-get install compizconfig--settings-manager && ccsm This will open a GUI app namely "Compiz Config Settings" There, you can find Unity plug-in and enable it. – Ege Sucu Mar 21 '17 at 17:17
  • @Egrimo Yes, I can use the terminal in tty mode. I have tried your recommended commands but it seems they didn't work, that GUI app didn't appear on the screen. There're just a few warnings, and the last warning is: CurrentScreenNum = gtk.gdk.display_get_default().get_default_screen().get_number() and AttributeError: 'NonType' object has no attribute 'get_default_screen'. Do you have another solution? – Minh Andrew Mar 22 '17 at 09:13
  • @Egrimo Oops ! I can't believe that this time, when I turned the computer on, it appeared the screen normally, no dark screen !!! Can anyone tell me what the hell is going on? I can login to Ubuntu normally, all softwares, apps and data is safe, nothing is lost, unlike before !!! – Minh Andrew Mar 22 '17 at 14:32
  • Notice that before, I have sometimes pressed Fn + F1 to change the resolution, is it a reason ? – Minh Andrew Mar 22 '17 at 14:45
  • @MinhAndrew It's probably the reason that you rebooted the OS and fixed before but needed to reboot the machine. – Ege Sucu Mar 22 '17 at 18:31

1 Answers1

0

The following command worked for me.

sudo apt-get install --reinstall ubuntu-desktop
drmaa
  • 303
  • 3
  • 12