ubuntu-apt-sources/retroshare-ubuntu-stable-cosmic.list

# curl https://download.opensuse.org/repositories/network:/retroshare/xUbuntu_19.04/Release.key | sudo apt-key add -
deb https://download.opensuse.org/repositories/network:/retroshare/xUbuntu_19.04/ ./
	`# curl https://download.opensuse.org/repositories/network:/retroshare/xUbuntu_19.04/Release.key \| sudo apt-key add -`
	`deb https://download.opensuse.org/repositories/network:/retroshare/xUbuntu_19.04/ ./`