1

This question already has an answer here:

The repository 'http://ppa.launchpad.net/modycz/heimdall/ubuntu bionic Release'
does not have a Release file. 

Just started two weeks ago on Ubuntu. real novice!

marked as duplicate by karel, pomsky, Thomas, K7AAY, Eric Carvalho Sep 28 '18 at 16:02

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4

Answer to your question

According to this page on Launchpad, the newest versions of this PPA are devel and utopic, dated August 2014. Your current distro (bionic) is therefore too young to be found in this PPA.

Answer to your problem

Heimdall is in Ubuntu 18.04, only it's not called heimdall but heimdall-flash:

$ apt search heimdall
Sorting... Done
Full Text Search... Done
heimdall-flash/bionic 1.4.1-2 amd64
  tool for flashing firmware on Samsung Galaxy S devices

heimdall-flash-frontend/bionic 1.4.1-2 amd64
  tool for flashing firmware on Samsung Galaxy S devices - Qt GUI

So you can install it with

sudo apt install heimdall-flash

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