Hi Cryolithe,
I know that glibc changed things in 2.31 but I thought that is in proposed 
still.
I was working (I thought just for test/build issues) on an update in bug 
1866753.
It does internal syscall filtering and that changed in glibc.
Out of that I already have PPA: 
https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/3968
Soon that will show up in focal-proposed anyway, but still.

@Cryolithe - would you mind trying if that PPA resolves it for you and report 
back here?
- Also are you running -proposed enabled?
- And anyway the report lacks some data - which Ubuntu release are you running 
atm?
  $ cat /etc/os-release
  $ apt-cache policy chrony
It would also be great to run apport to get the package upgrade history and all 
that right away.
 $ apport-collect 1867036

Finally maybe we should check and compare caps in your system
  $ apt install libcap-ng-utils
  $ pscap -a
  # if the service didn't fail but keeps running with reduced caps

Example output on a container:
root@f:~# pscap -a | grep chrony
1     26441 _chrony     chronyd           net_bind_service
26441 26442 _chrony     chronyd           net_bind_service
Example output on a VM:
@f $ pscap -a | grep chrony
1     1707  _chrony     chronyd           net_bind_service, sys_time +
1707  1708  _chrony     chronyd           net_bind_service, sys_time +


** Changed in: chrony (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1867036

Title:
  Focal Fossa : chronyd unable to sync system clock

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