Looks like it's the old Network Time Sync error, which you encounter only now. The problem was discussed and solved in Development Portal here, as well as in many threads in the forum.
This set of commands should solve the issue. It's a bit redundant, but works well:
sudo rm --recursive /var/lib/systemd/timesync
sudo systemctl disable systemd-timesyncd.service
sudo systemctl enable systemd-timesyncd.service
sudo systemctl start systemd-timesyncd.service
sudo systemctl status systemd-timesyncd.service