@Ubuntu Foundations Team Bug Bot (crichton) and John Kim (kotux) :
Thanks for taking the time to answer; I have uninstalled the offending
qemu package. Besides, I won't test that environment again, especially
because I have now a native Ubuntu 13.10 system (not "VMed"), and I will
try to compile and nstall a newer qemu package on it. I'll let you know
if I experience similar issues.

@Joseph Salisbury (jsalisbury) : thanks for your answer. same as above
+:

3.14 is not yet stable. I have already installed 3.13.6 on my new native Ubuntu 
, and I have boot problem with:
- an endless purple screen on the first boot, but I have access to the grub 
menu on the second boot right after the first one. Yes, I know, it sounds 
strange!
- choosing 3.13.6 leads to the same endless purple screen; I suspect issues 
with the video driver (Nvidia on my system)

Luckily, I can still boot with the old 3.11 kernel. But this release has
old buggy drivers.... Speaking of which I do not understand why it is so
complicated to install proprietary drivers such as Nvidia graphic ones.

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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1242093

Title:
  Black Screen in Ubuntu 13.10

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Environment: VirtualBox 4.2.18 on Windows 7 host - Ubuntu 13.10 Guest

  I used to run Ubuntu 13.04 on the same environment without ever such
  problem.

  This black screen happened during qemu 1.6.1 compilation, which I have
  already performed without any issue on previous Ubuntu release.

  When I move the mouse, the screen flickers between black and the wallpaper.
  When I don't touch either the mouse or the keyboard, the screen is completely 
black.

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