Public bug reported:

Running ubuntu-20.04.2-preinstalled-server-arm64+raspi.img on a
Raspberry PI 3

After installation of the Ubuntu software updating apps and installing
new apps fail. Several repositories cannot be accessed because their
certificates aren't yet valid. The reason is that the 'timedate' service
does not synchronize the system clock after boot. At the moment the
system clock will be set on the first system start 1 year behind
(1.4.2020).

Workaround: After replacing timedate with ntp all works fine.

$ sudo timedatectl set-ntp no
$ sudo apt install ntp
$ ntpq -p

** Affects: ubuntu
     Importance: Undecided
         Status: New


** Tags: 20.04.2 arm64 installing raspberry ubuntu updating

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https://bugs.launchpad.net/bugs/1920808

Title:
  ubuntu-20.04.2 for raspberry, updating and installing errors

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