Some "journalctl -k"-output, getting a lots of "DNSSEC validation failed"-errors:

Nov 03 19:24:05 ubuntu-mate systemd-resolved[2632]: DNSSEC validation failed for question com IN DNSKEY: signature-expired
Nov 03 19:24:05 ubuntu-mate systemd-resolved[2632]: DNSSEC validation failed for question com IN DS: signature-expired
Nov 03 19:24:05 ubuntu-mate systemd-resolved[2632]: DNSSEC validation failed for question . IN DNSKEY: signature-expired
Nov 03 19:24:05 ubuntu-mate systemd-resolved[2632]: DNSSEC validation failed for question daisy.ubuntu.com IN A: signature-expired
Nov 03 19:24:05 ubuntu-mate systemd-resolved[2632]: DNSSEC validation failed for question daisy.ubuntu.com IN SOA: signature-expired
Nov 03 19:24:05 ubuntu-mate systemd-resolved[2632]: DNSSEC validation failed for question daisy.ubuntu.com IN DS: signature-expired
Nov 03 19:24:05 ubuntu-mate systemd-resolved[2632]: DNSSEC validation failed for question ubuntu.com IN SOA: signature-expired
Nov 03 19:24:05 ubuntu-mate whoopsie[2004]: [19:24:05] Found usable connection: /org/freedesktop/NetworkManager/ActiveConnection/0
Nov 03 19:24:05 ubuntu-mate whoopsie[2004]: [19:24:05] Not a paid data plan: /org/freedesktop/NetworkManager/ActiveConnection/0
Nov 03 19:24:05 ubuntu-mate whoopsie[2004]: [19:24:05] The default IPv4 route is: /org/freedesktop/NetworkManager/ActiveConnection/0
Nov 03 19:24:05 ubuntu-mate dbus-daemon[3146]: Activating service name='org.freedesktop.Notifications'
Nov 03 19:24:05 ubuntu-mate systemd-resolved[2632]: DNSSEC validation failed for question ubuntu.com IN DS: signature-expired
Nov 03 19:24:05 ubuntu-mate systemd-resolved[2632]: DNSSEC validation failed for question com IN DNSKEY: signature-expired
Nov 03 19:24:05 ubuntu-mate systemd-resolved[2632]: DNSSEC validation failed for question com IN DS: signature-expired
Nov 03 19:24:05 ubuntu-mate whoopsie[2004]: [19:24:05] Cannot reach: https://daisy.ubuntu.com
Nov 03 19:24:05 ubuntu-mate systemd-resolved[2632]: DNSSEC validation failed for question . IN DNSKEY: signature-expired
Nov 03 19:24:05 ubuntu-mate nm-dispatcher[4623]: req:2 'up' [wlP1p17s0]: start running ordered scripts...
Nov 03 19:24:05 ubuntu-mate avahi-daemon[2034]: Registering new address record for fe80::923:f762:65ee:a8b5 on wlP1p17s0.*.
Nov 03 19:24:05 ubuntu-mate avahi-daemon[2034]: New relevant interface wlP1p17s0.IPv6 for mDNS.
Nov 03 19:24:05 ubuntu-mate avahi-daemon[2034]: Joining mDNS multicast group on interface wlP1p17s0.IPv6 with address fe80::923:f762:65ee:a8b5.
Nov 03 19:24:05 ubuntu-mate nm-dispatcher[4623]: req:2 'up' [wlP1p17s0]: new request (3 scripts)
Nov 03 19:24:05 ubuntu-mate nm-dispatcher[4623]: req:1 'connectivity-change': start running ordered scripts...
Nov 03 19:24:05 ubuntu-mate nm-dispatcher[4623]: req:1 'connectivity-change': new request (3 scripts)
Nov 03 19:24:05 ubuntu-mate systemd[1]: Started Network Manager Script Dispatcher Service.
Nov 03 19:24:05 ubuntu-mate dbus[1946]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Nov 03 19:24:05 ubuntu-mate systemd-resolved[2632]: Switching to DNS server 192.168.3.1 for interface wlP1p17s0.
Nov 03 19:24:05 ubuntu-mate NetworkManager[2012]: <info>  [1478201045.0541] device (wlP1p17s0): Activation: successful, device activated.
Nov 03 19:24:05 ubuntu-mate NetworkManager[2012]: <info>  [1478201045.0019] policy: set 'Carcosa' (wlP1p17s0) as default for IPv4 routing and DNS
Nov 03 19:24:04 ubuntu-mate NetworkManager[2012]: <info>  [1478201044.9885] manager: NetworkManager state is now CONNECTED_GLOBAL
Nov 03 19:24:04 ubuntu-mate systemd[1]: Starting Network Manager Script Dispatcher Service...
Nov 03 19:24:04 ubuntu-mate dbus[1946]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service'
Nov 03 19:24:04 ubuntu-mate NetworkManager[2012]: <info>  [1478201044.9353] manager: NetworkManager state is now CONNECTED_LOCAL
Nov 03 19:24:04 ubuntu-mate NetworkManager[2012]: <info>  [1478201044.9264] device (wlP1p17s0): state change: secondaries -> activated (reason 'none') [90 100 0]
Nov 03 19:24:04 ubuntu-mate NetworkManager[2012]: <info>  [1478201044.9118] device (wlP1p17s0): state change: ip-check -> secondaries (reason 'none') [80 90 0]
Nov 03 19:24:04 ubuntu-mate NetworkManager[2012]: <info>  [1478201044.8959] device (wlP1p17s0): state change: ip-config -> ip-check (reason 'none') [70 80 0]
Nov 03 19:24:04 ubuntu-mate avahi-daemon[2034]: Registering new address record for 192.168.3.2 on wlP1p17s0.IPv4.
Nov 03 19:24:04 ubuntu-mate avahi-daemon[2034]: New relevant interface wlP1p17s0.IPv4 for mDNS.
Nov 03 19:24:04 ubuntu-mate avahi-daemon[2034]: Joining mDNS multicast group on interface wlP1p17s0.IPv4 with address 192.168.3.2.
Nov 03 19:24:04 ubuntu-mate dhclient[4609]: bound to 192.168.3.2 -- renewal in 3536 seconds.
Nov 03 19:24:04 ubuntu-mate NetworkManager[2012]: <info>  [1478201044.8428] dhcp4 (wlP1p17s0): state changed unknown -> bound
Nov 03 19:24:04 ubuntu-mate NetworkManager[2012]: <info>  [1478201044.8427] dhcp4 (wlP1p17s0):   domain name 'elmstreet.hel'
Nov 03 19:24:04 ubuntu-mate NetworkManager[2012]: <info>  [1478201044.8427] dhcp4 (wlP1p17s0):   nameserver '192.168.3.1'
Nov 03 19:24:04 ubuntu-mate NetworkManager[2012]: <info>  [1478201044.8426] dhcp4 (wlP1p17s0):   hostname 'byakhee'
Nov 03 19:24:04 ubuntu-mate NetworkManager[2012]: <info>  [1478201044.8425] dhcp4 (wlP1p17s0):   lease time 7200
Nov 03 19:24:04 ubuntu-mate NetworkManager[2012]: <info>  [1478201044.8424] dhcp4 (wlP1p17s0):   server identifier 192.168.3.1
Nov 03 19:24:04 ubuntu-mate NetworkManager[2012]: <info>  [1478201044.8423] dhcp4 (wlP1p17s0):   gateway 192.168.3.1
Nov 03 19:24:04 ubuntu-mate NetworkManager[2012]: <info>  [1478201044.8406] dhcp4 (wlP1p17s0):   plen 24 (255.255.255.0)
Nov 03 19:24:04 ubuntu-mate NetworkManager[2012]: <info>  [1478201044.8387] dhcp4 (wlP1p17s0):   address 192.168.3.2