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Re: Anyone know what this means when running aptitude update?

On Mon, Mar 27, 2017 at 06:06:05PM +0200, Frank wrote:
> Op 27-03-17 om 17:14 schreef Mark Fletcher:
> >Well, switching from http.debian.net to deb.debian.org seems to have
> >fixed that one. The error relating to that has gone away.
> Don't be surprised if it comes back. I think it may just have selected a
> different mirror now, but you can't be certain it will always pick that one.

Right. So far it hasn't but I get what you are saying. I don't believe, 
however, that I ran for weeks getting redirected to the same mirror and 
getting the same error and then at the moment I switched my settings the 
mirror changed and solved the problem by coincidence. Clearly the change 
had an impact. So that's good.

> >>>wget -qO- https://dl.google.com/linux/linux_signing_key.pub | sudo
> >>>apt-key add -
> >>
> >>No, please do NOT use "apt-key add" but instead download the key and put
> >>it as a file with the suffix ".gpg" into the directory
> >>/etc/apt/trusted.gpg.d/
> >>
> >I downloaded the file from the above URL, and copied it as root to
> >/etc/apt/trusted.gpg.d as instructed. Since all the other files in that
> >directory were owned by root I made sure this one was too. And I renamed
> >it to add .gpg on the end.
> That's for binary key files. This one is ascii armoured, so it needs an .asc
> 'extension'.

Right, for the key issue, that has taken me right back to where I started:

W: There is no public key available for the following key IDs:

Now that is the only complaint, which is a significant improvement on 
where I started thanks to the fixed mirror, but the key ID issue isn't 

I tried naming the file linux_signing_key.pub.asc and 
linux_signing_key.pub.gpg.asc .

Neither worked (in the sense that the warning above appeared). Since 
this is the warning I was getting to start with, it almost feels like 
this file is either not being read (although naming it ending .gpg 
causes mayhem so I guess it is) or it doesn't contain what I need. I 
downloaded it using the wget command above except without the -qO- 
because I wanted to see what wget was doing and I didn't want the 
downloaded result going to standard output.

Possibly stupid question -- this is Jessie, does this mechanism of 
dropping the files in trusted.gpg.d work properly in Jessie or is it