Install failing in Ubuntu 20.4

[anbuanand]

Install failing as per instructions , getting the message. Error - Failed to fetch http://dl.bintray.com/nrel/api-umbrella-ubuntu/dists/bionic/InRelease 403 Forbidden [IP: 34.215.99.236 80] E: The repository 'http://dl.bintray.com/nrel/api-umbrella-ubuntu bionic InRelease' is not signed. 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.

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[remcoboerma]

The entire bintray service has been sunset:

Thanks for supporting Bintray! This service has now been sunset, and to assist with migration to the JFrog Platform, paid accounts can login until July 4th.