I have the following in my debian (testing) sources.list.d directory
# http://www.bigv.io/download deb http://client.bigv.io/apt/ ./
Yet when I try the u command within aptitude it complains
W:Failed to fetch http://client.bigv.io/apt/./Release: Invalid 'Date' entry in Release file /var/lib/apt/lists/client.bigv.io_apt_._Release E: Some index files failed to download. They have been ignored, or old ones used instead.
I must admit, I haven’t used the bigv client for sometime now (18 months ish) and I can’t remember what it was for. So I don’t know if I can un-install it.