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Just installed 14.04.2 LTS i386 as a VirtualBox VM, on a Windows 7 host with AMD 64 processor.

Then, I could not log in normally. It accepts my username & pswd, thinks a while, then resets the greeting screen. I can log in via tty (ctrl-alt-F1).

Installed guest additions successfully from tty session. Restarted, the screen size is now larger, showing that guest additions are effective (at least partially). But I still cannot log in at the desktop.

In my home dir, file .xsession-errors starts with these lines:

> libGL error: pci id for fd 4: 80ee:beef, driver (null)
> libGL error: core dri or dri2 extension not found
> libGL error: failed to load driver: vboxvideo

So libGL can't find dri or dri2, and fails to load the vboxvideo driver. Surely this was a failure during ubuntu installation, right? In /var/log I checked three vbox additions log files and found no errors. But Xorg.0.log has this:

> AIGLX error: vboxvideo does not support required DRI extension
> AIGLX: reverting to software rendering
> AIGLX: Loaded and initialized swrast
> GLX: Initialized DRISWRAST GL provider for screen 0
> VBoxVideo(0): Setting screen physical size to 277 x 182

So, is my virtual machine insufficient to support the Ubuntu Unity interface, is that the problem? Or is it maybe something else?

Would best step be to just start over, installing linux into a new VM with increased base memory and video memory?

Thank you!

-- Peter

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I had the problem after I run startx while I had root permissions.

I solved the problem looking at this post

Basically you do

cd ~

and then

sudo chown username:groupname .Xauthority

where username and groupname has to be changed accordingly

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