Why does this appear? I hadn't had this problem on 16.04, now on 18.04 I have it. If I dosable it since there is no release file, how will I find out when they publish a release file?
E:The repository 'https://packages.cisofy.com/community/lynis/deb bionic Release' does not have a Release file.
W:Updating from such a repository can't be done securely, and is therefore disabled by default.
W:See apt-secure(8) manpage for repository creation and user configuration details.
E:The repository 'http://dell.archive.canonical.com/updates/dists bionic-dell Release' does not have a Release file.