"This PPA does not support bionic"

[freder]

just tried to install on mint 19.3

% add-apt-repository ppa:ys/emojione-picker
Cannot add PPA: ''This PPA does not support bionic''.

[palaashatri]

Package PPA has not been updated to support releases post-Ubuntu 16.04.
Try going through the "Method 3" instructions at this link and it should work

[tanius]

There is a similar error message on Ubuntu 19.10 (and similar solution, for which see above).

I'll copy the full error message here for those looking for this solution by search engine. From the "does not have a Release file" wording it is not very clear that the PPA simply does not support Ubuntu 19.10, but that's what add-apt-repository is trying to tell you. And unlike with dpkg, there's no way to trick add-apt-repository into installing a package that was not meant for your distribution version (but might work anyway).

% add-apt-repository ppa:ys/emojione-picker

E: The repository 'http://ppa.launchpad.net/ys/emojione-picker/ubuntu eoan Release' 
   does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

[palaashatri]

Package PPA has not been updated to support releases post-Ubuntu 16.04.
Try going through the "Method 3" instructions at this link and it should work

People still don't seem to be reading the README.md carefully. So, I'll pick this up from the README directly (please follow the steps) :

Method 3: Standalone installer (should work on any distro!)

This method does not require root access. If you run it as root, the picker will be installed for all users.

1. Clone the repository and cd into it: git clone https://github.com/gentakojima/emojione-picker-ubuntu; cd emojione-picker-ubuntu
2. Checkout the latest stable release. List the available releases: git tag -l and checkout, for example: git checkout v0.1 (you can ignore this step to build the current development version instead, that may or may not work properly).
3. Run ./install.sh
4. If you want to uninstall it later, just run ./install.sh again.