Indeed. Warning aren’t a blocker. But it’s always better to get clean log

Almost there. The date error dissapeared but I get a new one about i386. W: Skipping acquire of configured file ‘main/binary-i386/Packages’ as repository ‘https://pkg.duosecurity.com/Ubuntu bionic InRelease’ does not seem to provide it (sources.list...

Yes. But like I said there is 2 distinct bug. The got key and the date from the release file. I correctly updated the gpg, but the date is still making an apt error (I haven’t try on Debian, only Ubuntu)

There is 2 types of error here. The GP Key must but update with : curl -s https://duo.com/APT-GPG-KEY-DUO | sudo apt-key add - For the date, I have this error too. But I think this must be corrected by Duo teams in the file https://pkg.duosecurity...