[Debian-handbook-translators] VirtualBox-related packages are removed from Stretch

[AYANOKOUZI, Ryuunosuke]

Dear debian-handbook authors,

Thanks for updating debian-handbook for Stretch.

In Stretch, VirtualBox-related packages are removed.
We would like to request your reconsideration about mentioning VirtualBox [1,2].
And it might be a good example for installing package from unstable in stable system
using "APT::Default-Release".

[1] "4.2.17. Selecting Packages for Installation"
    "For instance, if a VirtualBox virtual machine is detected,
    the program will install the virtualbox-guest-dkms package, allowing
    for better integration of the virtual machine with the host system."

[2] "12.2. Virtualization"
    "VirtualBox is a virtual machine that is mostly free software (some
    extra components are available under a proprietary
    license). Unfortunately it is in Debian's “contrib” section because
    it includes some precompiled files that cannot be rebuilt without a
    proprietary compiler."

Sincerely yours,
Ryuunosuke Ayanokouzi
-- 
AYANOKOUZI, Ryuunosuke <i38w7i3 at yahoo.co.jp>
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