Hi, I cannot install a web application on ubuntu 20.04 or 18.04. It is getting an error.
404 Not Found [IP: 188.8.131.52 80] Reading package lists… Done E: The repository ‘http://ppa.launchpad.net/brightbox/ruby-ng/ubuntu focal 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…
This is the application that I want to install through curl curl https://raw.githubusercontent.com/atech/postal/master/script/install/ubuntu1604.sh | sh
Plz help me as soon as possible. I want to install it as soon as possible
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