Recently running Ubuntu 19.04, I noticed the following when adding the official bitcoin PPA
After running:
0$ sudo add-apt-repository ppa:bitcoin/bitcoin
1$ sudo apt update
I get the following error:
0...
1W: The repository 'http://ppa.launchpad.net/bitcoin/bitcoin/ubuntu disco Release' does not have a Release file.
2N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
3N: See apt-secure(8) manpage for repository creation and user configuration details.
I have to run the following to actually fetch the update information:
0$ sudo apt-get update --allow-insecure-repositories
I think this is an easy fix given the right credentials for the PPA repo?