Thanks to all for the reactions on my request.
With your help and advices I decided to start with simply dual boot, as I
indeed do not have to use booth on regulary base.
So i check the Bios and find that bios is running EUFI and that
virtualization is ON, and Fastboot is OFF, and SecureBoot is OFF.
I started with xubuntu-16.04-desktop-amd64.iso on DVD, choose my language
(nederlands) and keyboard (belgian), fill in name, and password, and
everything was running fine till the screen showed the message "thank you
for choosing Xubuntu" and I had
the errot message "*package Grub-efi-amd64-signed" cannot be written to
/target" *and *"please understand that the system will not reboot in
Xubuntu, we will end this installation"* (as it was written in Dutch I give
you a tranlation ;-).

I repeat this installation twice, but with the same result.

Any ideas why?

Paul

2018-03-11 21:47 GMT+01:00 Ralf Mardorf <silver.bul...@zoho.com>:

> On Sun, 11 Mar 2018 21:26:19 +0100, Antoine Pitrou wrote:
> >And, yes, of course a SSD makes things massively better for any VM.
>
> That's the whole point. The reason I'm using vbox with QCOW instead of
> VDI was the plan to migrate from vbox to KVM. As a side joke, it would
> require QCOW2 or RAW to migrate directly, however, while on my old
> machine SSD under SATA2 wasn't that much of an enhancement, it became a
> pleasure when migrating to my new SATA3 machine ;). Indeed, vbox still
> has got disadvantages, KVM unlikely does has got, but IMO it's no worse
> the hassle to prefer a less user friendly VM over vbox, unless there
> should be a really, really good reason to do this. Regarding
> performance the bottleneck were HDDs as well as SDD drives run under
> SATA2 instead of SATA3. Once you are using SATA3 and SSDs there is no
> performance issue. Just for very, very specific usage, vbox is utter
> crap and it's really worse to consider to migrate to a VM that
> requieres much more maintenance. YMMV!
>
>
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