problem not solved

[Amitjatola]

~$ sudo add-apt-repository "deb https://repo.sovrin.org/sdk/deb bionic stable" Hit:1 http://security.ubuntu.com/ubuntu bionic-security InRelease
Hit:2 http://us.archive.ubuntu.com/ubuntu bionic InRelease
Hit:3 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease
Hit:4 http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease
Ign:5 https://repo.sovrin.org/sdk/deb (bionic) InRelease Hit:6 https://repo.sovrin.org/sdk/deb bionic InRelease Hit:7 https://repo.sovrin.org/sdk/deb xenial InRelease Err:8 https://repo.sovrin.org/sdk/deb (bionic) Release 404 Not Found [IP: 3.17.126.236 443] Reading package lists... Done E: The repository 'https://repo.sovrin.org/sdk/deb (bionic) 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.

i followed the steps that u(@WadeBarnes) said above but still issue is not solved

[WadeBarnes]

This Docker example works:

FROM ubuntu:18.04
RUN apt-get update -y && apt-get install -y \
    gnupg \
    software-properties-common \
    apt-transport-https \
    ca-certificates

RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys CE7709D068DB5E88
# RUN echo "deb https://repo.sovrin.org/sdk/deb bionic stable" >> /etc/apt/sources.list
RUN add-apt-repository "deb https://repo.sovrin.org/sdk/deb bionic stable"
RUN apt-get update -y && apt-get install -y \
    libindy

[WadeBarnes]

Can you run apt list --upgradable on your system and see if libgnutls30 or the ca-certificates need to be updated?