jonas@jonas-Visionbook-14Wr-Plus:~$ sudo rfkill list
[sudo] jonas jelszava:       
0: hci0: Bluetooth
	Soft blocked: no
	Hard blocked: no
1: phy0: Wireless LAN
	Soft blocked: no
	Hard blocked: no
jonas@jonas-Visionbook-14Wr-Plus:~$ ping -c3 8.8.8.8
ping: connect: A hálózat elérhetetlen
jonas@jonas-Visionbook-14Wr-Plus:~$ ping -c3 www.nemzetisport.hu
ping: www.nemzetisport.hu: A név vagy a szolgáltatás nem ismert
jonas@jonas-Visionbook-14Wr-Plus:~$ sudo dhclient -v wlan0
Internet Systems Consortium DHCP Client 4.4.1
Copyright 2004-2018 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

RTNETLINK answers: Cannot assign requested address
Listening on LPF/wlan0/ff:ff:ff:ff:ff:ff
Sending on   LPF/wlan0/ff:ff:ff:ff:ff:ff
receive_packet failed on wlan0: Network is down
receive_packet failed on wlan0: Network is down
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 3 (xid=0x5ce6eb77)
send_packet: Network is down
dhclient.c:2570: Failed to send 300 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 3 (xid=0x5ce6eb77)
send_packet: Network is down
dhclient.c:2570: Failed to send 300 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 7 (xid=0x5ce6eb77)
send_packet: Network is down
dhclient.c:2570: Failed to send 300 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 11 (xid=0x5ce6eb77)
send_packet: Network is down
dhclient.c:2570: Failed to send 300 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 11 (xid=0x5ce6eb77)
send_packet: Network is down
dhclient.c:2570: Failed to send 300 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 12 (xid=0x5ce6eb77)
send_packet: Network is down
dhclient.c:2570: Failed to send 300 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 19 (xid=0x5ce6eb77)
send_packet: Network is down
dhclient.c:2570: Failed to send 300 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8 (xid=0x5ce6eb77)
send_packet: Network is down
dhclient.c:2570: Failed to send 300 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 13 (xid=0x5ce6eb77)
send_packet: Network is down
dhclient.c:2570: Failed to send 300 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 19 (xid=0x5ce6eb77)
send_packet: Network is down
dhclient.c:2570: Failed to send 300 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 19 (xid=0x5ce6eb77)
send_packet: Network is down
dhclient.c:2570: Failed to send 300 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8 (xid=0x5ce6eb77)
send_packet: Network is down
dhclient.c:2570: Failed to send 300 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 17 (xid=0x5ce6eb77)
send_packet: Network is down
dhclient.c:2570: Failed to send 300 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 19 (xid=0x5ce6eb77)
send_packet: Network is down
dhclient.c:2570: Failed to send 300 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 18 (xid=0x5ce6eb77)
send_packet: Network is down
dhclient.c:2570: Failed to send 300 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8 (xid=0x5ce6eb77)
send_packet: Network is down
dhclient.c:2570: Failed to send 300 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 11 (xid=0x5ce6eb77)
send_packet: Network is down
dhclient.c:2570: Failed to send 300 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 13 (xid=0x5ce6eb77)
send_packet: Network is down
dhclient.c:2570: Failed to send 300 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 15 (xid=0x5ce6eb77)
send_packet: Network is down
dhclient.c:2570: Failed to send 300 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 17 (xid=0x5ce6eb77)
send_packet: Network is down
dhclient.c:2570: Failed to send 300 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 21 (xid=0x5ce6eb77)
send_packet: Network is down
dhclient.c:2570: Failed to send 300 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 10 (xid=0x5ce6eb77)
send_packet: Network is down
dhclient.c:2570: Failed to send 300 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 12 (xid=0x5ce6eb77)
send_packet: Network is down
dhclient.c:2570: Failed to send 300 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 7 (xid=0x5ce6eb77)
send_packet: Network is down
dhclient.c:2570: Failed to send 300 byte long packet over wlan0 interface.
No DHCPOFFERS received.
No working leases in persistent database - sleeping.
jonas@jonas-Visionbook-14Wr-Plus:~$ echo -e '\nauto lo\niface lo inet loopback\n \nauto wlan0\niface wlan0 inet dhcp' | sudo tee -a /etc/network/interfaces

auto lo
iface lo inet loopback
 
auto wlan0
iface wlan0 inet dhcp
jonas@jonas-Visionbook-14Wr-Plus:~$ sudo ifdown wlan0 && sudo ifup -v wlan0
ifdown: interface wlan0 not configured

ifup: configuring interface wlan0=wlan0 (inet)
run-parts --exit-on-error --verbose /etc/network/if-pre-up.d
run-parts: executing /etc/network/if-pre-up.d/bridge
run-parts: executing /etc/network/if-pre-up.d/ethtool
run-parts: executing /etc/network/if-pre-up.d/wireless-tools
run-parts: executing /etc/network/if-pre-up.d/wpasupplicant

CLIENT="-i";  /sbin/dhclient -1 -4 -v $CLIENT -pf /run/dhclient.wlan0.pid -lf /var/lib/dhcp/dhclient.wlan0.leases -I -df /var/lib/dhcp/dhclient6.wlan0.leases wlan0 	
Internet Systems Consortium DHCP Client 4.4.1
Copyright 2004-2018 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

RTNETLINK answers: Cannot assign requested address
Listening on LPF/wlan0/ff:ff:ff:ff:ff:ff
Sending on   LPF/wlan0/ff:ff:ff:ff:ff:ff
Sending on   Socket/fallback
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 3 (xid=0xb9c40720)
send_packet: Network is down
receive_packet failed on wlan0: Network is down
receive_packet failed on wlan0: Network is down
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 4 (xid=0xb9c40720)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 10 (xid=0xb9c40720)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 14 (xid=0xb9c40720)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 10 (xid=0xb9c40720)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 12 (xid=0xb9c40720)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 13 (xid=0xb9c40720)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 20 (xid=0xb9c40720)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 10 (xid=0xb9c40720)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 14 (xid=0xb9c40720)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 14 (xid=0xb9c40720)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 13 (xid=0xb9c40720)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8 (xid=0xb9c40720)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 13 (xid=0xb9c40720)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 9 (xid=0xb9c40720)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 12 (xid=0xb9c40720)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 16 (xid=0xb9c40720)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 20 (xid=0xb9c40720)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 14 (xid=0xb9c40720)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 15 (xid=0xb9c40720)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 17 (xid=0xb9c40720)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 7 (xid=0xb9c40720)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 11 (xid=0xb9c40720)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 20 (xid=0xb9c40720)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 2 (xid=0xb9c40720)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
No DHCPOFFERS received.
No working leases in persistent database - sleeping.
run-parts --exit-on-error --verbose /etc/network/if-up.d
run-parts: executing /etc/network/if-up.d/avahi-autoipd
run-parts: executing /etc/network/if-up.d/ethtool
run-parts: executing /etc/network/if-up.d/openvpn
run-parts: executing /etc/network/if-up.d/resolved
/etc/network/if-up.d/resolved: 12: mystatedir: not found
run-parts: executing /etc/network/if-up.d/wpasupplicant
ifup: configuring interface wlan0=wlan0 (inet)
run-parts --exit-on-error --verbose /etc/network/if-pre-up.d
run-parts: executing /etc/network/if-pre-up.d/bridge
run-parts: executing /etc/network/if-pre-up.d/ethtool
run-parts: executing /etc/network/if-pre-up.d/wireless-tools
run-parts: executing /etc/network/if-pre-up.d/wpasupplicant

CLIENT="-i";  /sbin/dhclient -1 -4 -v $CLIENT -pf /run/dhclient.wlan0.pid -lf /var/lib/dhcp/dhclient.wlan0.leases -I -df /var/lib/dhcp/dhclient6.wlan0.leases wlan0 	
Internet Systems Consortium DHCP Client 4.4.1
Copyright 2004-2018 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

RTNETLINK answers: Cannot assign requested address
Listening on LPF/wlan0/ff:ff:ff:ff:ff:ff
Sending on   LPF/wlan0/ff:ff:ff:ff:ff:ff
Sending on   Socket/fallback
receive_packet failed on wlan0: Network is down interval 3 (xid=0xa8b7fd0e)
send_packet: Network is down
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 3 (xid=0xa8b7fd0e)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 6 (xid=0xa8b7fd0e)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 15 (xid=0xa8b7fd0e)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 20 (xid=0xa8b7fd0e)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8 (xid=0xa8b7fd0e)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 17 (xid=0xa8b7fd0e)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 7 (xid=0xa8b7fd0e)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 7 (xid=0xa8b7fd0e)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 19 (xid=0xa8b7fd0e)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 9 (xid=0xa8b7fd0e)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 12 (xid=0xa8b7fd0e)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8 (xid=0xa8b7fd0e)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 19 (xid=0xa8b7fd0e)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 7 (xid=0xa8b7fd0e)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 10 (xid=0xa8b7fd0e)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 19 (xid=0xa8b7fd0e)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 18 (xid=0xa8b7fd0e)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 16 (xid=0xa8b7fd0e)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 14 (xid=0xa8b7fd0e)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 10 (xid=0xa8b7fd0e)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 12 (xid=0xa8b7fd0e)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 9 (xid=0xa8b7fd0e)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 10 (xid=0xa8b7fd0e)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 10 (xid=0xa8b7fd0e)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 13 (xid=0xa8b7fd0e)
send_packet: Network is down
dhclient.c:2570: Failed to send 314 byte long packet over wlan0 interface.
No DHCPOFFERS received.
No working leases in persistent database - sleeping.
run-parts --exit-on-error --verbose /etc/network/if-up.d
run-parts: executing /etc/network/if-up.d/avahi-autoipd
run-parts: executing /etc/network/if-up.d/ethtool
run-parts: executing /etc/network/if-up.d/openvpn
run-parts: executing /etc/network/if-up.d/resolved
/etc/network/if-up.d/resolved: 12: mystatedir: not found
run-parts: executing /etc/network/if-up.d/wpasupplicant
jonas@jonas-Visionbook-14Wr-Plus:~$ sudo systemctl restart NetworkManager
jonas@jonas-Visionbook-14Wr-Plus:~$