I have verified that the date is indeed the problem. When I run an ubuntu container privileged, the container has the correct date and apt update succeeds. But when I run the container privileged and set the date to 1971, then I get that same error message from apt update.
Therefore, this bug is a duplicate of bug #1896443 pi@raspberrypi:~ $ docker run --privileged -it ubuntu bash root@ad897025c4b7:/# date "+%Y-%m-%d %H:%M:%S" -s "1971-01-01 00:00:00" 1971-01-01 00:00:00 root@ad897025c4b7:/# apt update Get:1 http://ports.ubuntu.com/ubuntu-ports focal InRelease [265 kB] Get:2 http://ports.ubuntu.com/ubuntu-ports focal-updates InRelease [111 kB] Get:3 http://ports.ubuntu.com/ubuntu-ports focal-backports InRelease [98.3 kB] Get:4 http://ports.ubuntu.com/ubuntu-ports focal-security InRelease [107 kB] Reading package lists... Done E: Release file for http://ports.ubuntu.com/ubuntu-ports/dists/focal/InRelease is not valid yet (invalid for another 18010d 17h 33min 0s). Updates for this repository will not be applied. E: Release file for http://ports.ubuntu.com/ubuntu-ports/dists/focal-updates/InRelease is not valid yet (invalid for another 18222d 10h 50min 54s). Updates for this repository will not be applied. E: Release file for http://ports.ubuntu.com/ubuntu-ports/dists/focal-backports/InRelease is not valid yet (invalid for another 18222d 10h 51min 16s). Updates for this repository will not be applied. E: Release file for http://ports.ubuntu.com/ubuntu-ports/dists/focal-security/InRelease is not valid yet (invalid for another 18222d 10h 50min 42s). Updates for this repository will not be applied. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1890332 Title: apt update fails on docker arm container 20.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libseccomp/+bug/1890332/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs