I ran a fresh install of Debian stretch 9.8.0 and all was well. I then ran

sudo apt update

and I get an output which hits the ftp.debian.stretch server for the update thing is it tells me

unable to retrieve update trusted.gpg keys unauthorised

So I do a bit of research and came across a post, it said

Rename trusted.gpg to trusted.gpg-broken

And now I can sudo apt update and basically get what ever I want as standard, but I don’t understand why after a fresh install the trusted keys were not found in the file?

And I also don’t understand what changing trusted.gpg to trusted.gpg-broken actually did to the keys.

  • This post? – pLumo Mar 8 '19 at 10:23
  • That’s the one I followed to get it working, but I want info on why this fixes it and what does -broken acctually do? Nice1 Rovo – Curiouskangaroo Mar 8 '19 at 11:52
  • -broken doesn't mean anything. You can call it -backup or simply delete it to have the same effect. Renaming the file is just to get the old one out of the way but don't delete it for backup reasons. I think when the file is missing, apt will somehow regenerate (and thus fix) it. Why it happens in the first place, I don't know. – pLumo Mar 8 '19 at 12:39
  • Sweet so just the renaming of it basically. When apt looks for the keys can not locate the directory so bypass that step I take it. – Curiouskangaroo Mar 8 '19 at 12:47

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