[Bug 815562] Re: Difficult to know why we can't find signing_key_fingerprint for a PPA

[Graham Leggett]

9 years later and this bug is still unfixed when building from Bionic.

The error

Error: signing key fingerprint does not exist
Failed to add key.

might be a statement of fact, but it doesn't tell me what I must do, or
whether my system is broken or not, or what action I must take.

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https://bugs.launchpad.net/bugs/815562

Title:
  Difficult to know why we can't find signing_key_fingerprint for a PPA

Status in software-properties package in Ubuntu:
  Confirmed

Bug description:
  I've created a PPA, but I haven't uploaded anything yet. On my development machine I tried to add the PPA using apt-apt-repository and I got the following error message: 
  «Error: can't find signing_key_fingerprint at https://launchpad.net/api/1.0/~joerlend.schinstad/+archive/testing»

  I thought I'd done something wrong, so I asked in #Launchpad where it
  was explained to me that keys aren't generated until the first upload.
  That sounds reasonable, but I think it should be easier to know why
  add-apt-repository fails. I also think it should be explained in pages
  like this one:
  https://help.launchpad.net/Packaging/PPA/InstallingSoftware

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