Public bug reported:

This may only affect armhf, but I can't see why it should.

Recent Linux kernels introduced a number of new syscalls ending in
_time64 to fix Y2038 problem; it appears recent glibc, including the
version in focal, test for the existence of these. systemd-nspawn in
bionic (237-3ubuntu10.38) doesn't know about these so blocks them by
default. It seems however glibc isn't expecting an EPERM, causing
numerous programs to fail.

In particular, running do-release-upgrade to focal in an nspawn
container hosted on bionic will break as soon as the new libc has been
unpacked.

Solution (tested here) is to cherrypick upstream commit
https://github.com/systemd/systemd/commit/6ca677106992321326427c89a40e1c9673a499b2

A newer libseccomp is also needed but this is already being worked on,
see bug #1876055.

It's a pretty trivial fix one the new libseccomp lands, and there is
precedent for SRU-ing for a similar issue in bug #1840640.

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1883447

Title:
  nspawn blocks _time64 syscalls, breaks upgrade to focal in containers

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