Hello, I quickly grepped my DEBIAN-USER mailing-list file but did not find any leapsecond in it, thus this message.
I get this error on all of my buster machines although I think they are uptodate: Dec 1 09:34:39 virtual ntpd[2432]: leapsecond file ('/usr/share/zoneinfo/leap-seconds.list'): will expire in less than 27 days A quick Internet search shows this: https://www.mail-archive.com/debian-glibc@lists.debian.org/msg59571.html Apparently, the Debian distributed file will expire on 2020-12-28. However, it seems the next Debian point release scheduled on 2020-12-05 contains an update for tzdata, so it should be fixed then.