Hi! Holger,

On 10/31/2016 09:51 AM, you wrote:

 HG> I do agree that "secure boot" should be activated, when the installation
 HG> is done, not before, as HP apparently has decided.

I'm of two minds, trying to decide if I should re-enable it as a level of user
security: to protect me from myself.  ;)

 HG> The settings for boot source were of course made in the BIOS.

Yes, but UEFI seems to be something from the future.  Or a dead end.[shrug] 
The alternate boot options that you & I know and love are considered by it as
'legacy' options.

 HG> Well, desktops or floor standing. I prefer floor standing towers,
 HG> because I can then use the top surface for the mouse mat.

I did a tally-up recently, and figured I've been using the same mouse mat for
nearly 25 years.  It was provided by a workmate back in 1993 (at least), from
offcuts of wetsuit material.  It's completely washable after it gets grungy. 
Of course!  :)

Cheers,
Paul.

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