Help! Ubuntu 15.04 Desktop is Incompatible with VirtualBox Graphics Adapter!

[Teo En Ming]

On Sun, Aug 9, 2015 at 4:58 PM,  <silver.bullet at zoho.com> wrote:
> On Sun, 9 Aug 2015 10:35:52 +0200, silver.bullet at zoho.com wrote:
>>On Sun, 9 Aug 2015 08:33:58 +0200, Petter Adsen wrote:
>>>On Sun, 9 Aug 2015 14:01:17 +0800
>>>Teo En Ming <teo.en.ming at gmail.com> wrote:
>>>
>>>> Dear Ubuntu Users,
>>>
>>><snip>
>>>
>>>You really should write shorter messages, it's a pain to read through
>>>this.
>>
>>+1
>>
>>I didn't read the complete mail and simply marked it as read.
>>
>>However, if Ubuntu can't start regarding graphics issues, then changing
>>the VM or waiting for another guest upgrade isn't the right way to go.
>>
>>How about booting the Ubuntu guest, log in tty1 and to start trouble
>>shooting?
>>
>>In tty1 [1] run
>>
>>grep EE /var/log/Xorg.0.log
>>
>>also check the log file of the display manager you're using [2].
>>
>>"Ubuntu 15.04 Desktop is incompatible with VirtualBox graphics adapter!
>>It says so in a random dialog box pop up."
>>
>>Who claims this? Host or guest?
>>
>>[1] IOW disable X, https://startpage.com/ , https://duckduckgo.com/ ...
>>[2] Perhaps https://wiki.ubuntu.com/LightDM , if not, then use
>>https://startpage.com/ , https://duckduckgo.com/ ...
>
> "I tried to login with my username and password at the lightdm display
> manager, but it keeps kicking me out and returning me to the login
> screen."
>
> With   Ctrl+Alt+F...   change to a tty.
>
> Post the output of grep EE /var/log/Xorg.0.log and the output of
> lightdm's log files
> ( https://duckduckgo.com/?q=ubuntu+lightdm+log+file ;).
>
> Perhaps even relevant output is too long to post it here, if so send a
> link to http://pastebin.com/ or a pastebin alternative were you posted
> the output.

Dear silver.bullet,

I have configured my Ubuntu 15.04 desktop virtual machine to use 1
virtual CPU instead of 4 virtual CPUs.

With 4 VCPUs, I will always get kicked out after logging in and
returning me to the login screen.

With 1 VCPU, at least I can login without getting kicked out. But the
task bar on the left side does not appear and all I get is a blank
desktop wallpaper. I can right click and start X terminal.

The output of "grep EE /var/log/Xorg.0.log" is as follows:

        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[    30.508] (EE) open /dev/fb0: No such file or directory
[    31.488] (EE) AIGLX error: vboxvideo does not export required DRI extension
[    31.488] (EE) AIGLX: reverting to software rendering
[    32.148] (II) XINPUT: Adding extended input device "VirtualBox
mouse integration" (type: TOUCHSCREEN, id 9)
[    32.204] (**) Option "config_info"
"udev:/sys/devices/pci0000:00/0000:00:06.0/usb2/2-1/2-1:1.0/0003:80EE:0021.0001/input/input5/event4"
[    32.204] (II) XINPUT: Adding extended input device "VirtualBox USB
Tablet" (type: TOUCHSCREEN, id 10)

There are several log files in /var/log/lightdm. Which one should I
copy and paste?

teo-en-ming at ubuntu1404:/var/log/lightdm$ ls
lightdm.log  lightdm.log.old  x-0-greeter.log  x-0-greeter.log.old
x-0.log  x-0.log.old  x-1-greeter.log  x-1-greeter.log.old  x-1.log
x-1.log.old

Yours sincerely,

Subtle Denial of Medical Treatment by the Singapore Government for Mr.
Teo En Ming (Zhang Enming)
Link: https://www.scribd.com/doc/258700156/Subtle-Denial-of-Medical-Treatment-by-the-Singapore-Government-for-Mr-Teo-En-Ming-Zhang-Enming