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I've set up an APT repo on sourceforge and have added a sources.list with
deb https://sourceforge.net/projects/zotero-deb/files/repo/bionic bionic main
when I try to run sudo apt update I get an error:
Ign:21 https://sourceforge.net/projects/zotero-deb/files/repo/bionic bionic InRelease
Err:...