** Description changed:

- In a fresh install of Kubuntu 16.04 (beta2) on a ThinkPad t460s, I can
- connect wireless to the local WLAN, but I don't have an internet
- connection. It is established through LAN though. And without being able
- to reproduce it, it seems that after being connected through LAN for
- some time, the internet connection through WLAN becomes active, too.
+ In a fresh install of Kubuntu 16.04 on a ThinkPad t460s, I can connect
+ wireless to the local WLAN, but I don't have an internet connection. A
+ ping to the router doesn't work in that case.
  
- At first it looked as if the error disappeared when I set the IPv6
- settings to "ignore", but the problem returned.
+ After some minutes, the connection usually (but not always) works.
  
- Here is some output that was asked for in forum discussions I found. If
- any more information is needed, let me know.
+ A LAN connection through the same router works, too. It seems that the
+ problem doesn't occur in every WLAN, but in my home network (using an O2
+ box) it always does.
  
+ The problem is reproducible with a Kubuntu Live CD/USB.
  
- jan@t460s:~$ lsb_release -rd
- Description:    Ubuntu Xenial Xerus (development branch)
- Release:        16.04
+ The following steps did not solve the problem:
  
- jan@t460s:~$ lspci -nnk | grep -iA2 net
- 00:1f.6 Ethernet controller [0200]: Intel Corporation Ethernet Connection 
I219-LM [8086:156f] (rev 21)
-         Subsystem: Lenovo Ethernet Connection I219-LM [17aa:2233]
-         Kernel driver in use: e1000e
-         Kernel modules: e1000e
- --
- 04:00.0 Network controller [0280]: Intel Corporation Wireless 8260 
[8086:24f3] (rev 3a)
-         Subsystem: Intel Corporation Wireless 8260 [8086:0130]
-         Kernel driver in use: iwlwifi
- 
- jan@t460s:~$ lsusb
- Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
- Bus 001 Device 005: ID 138a:0090 Validity Sensors, Inc. 
- Bus 001 Device 004: ID 04f2:b52c Chicony Electronics Co., Ltd 
- Bus 001 Device 002: ID 058f:9540 Alcor Micro Corp. AU9540 Smartcard Reader
- Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
- 
- jan@t460s:~$ lsmod                     
- Module                  Size  Used by
- ctr                    16384  2
- ccm                    20480  2
- bnep                   20480  2
- arc4                   16384  2
- intel_rapl             20480  0
- x86_pkg_temp_thermal    16384  0
- intel_powerclamp       16384  0
- coretemp               16384  0
- snd_soc_skl            49152  0
- iwlmvm                311296  0
- snd_soc_skl_ipc        32768  1 snd_soc_skl
- snd_hda_ext_core       28672  1 snd_soc_skl
- uvcvideo               90112  0
- videobuf2_vmalloc      16384  1 uvcvideo
- snd_hda_codec_hdmi     53248  1
- mac80211              733184  1 iwlmvm
- snd_soc_sst_ipc        16384  1 snd_soc_skl_ipc
- videobuf2_memops       16384  1 videobuf2_vmalloc
- kvm                   536576  0
- snd_soc_sst_dsp        53248  1 snd_soc_skl_ipc
- videobuf2_v4l2         28672  1 uvcvideo
- snd_soc_core          212992  1 snd_soc_skl
- snd_compress           20480  1 snd_soc_core
- snd_hda_codec_realtek    81920  1
- videobuf2_core         36864  2 uvcvideo,videobuf2_v4l2
- ac97_bus               16384  1 snd_soc_core
- v4l2_common            16384  1 videobuf2_v4l2
- snd_pcm_dmaengine      16384  1 snd_soc_core
- snd_hda_codec_generic    77824  1 snd_hda_codec_realtek
- iwlwifi               200704  1 iwlmvm
- videodev              176128  4 
uvcvideo,v4l2_common,videobuf2_core,videobuf2_v4l2
- dw_dmac_core           24576  1 snd_soc_sst_dsp
- irqbypass              16384  1 kvm
- media                  24576  2 uvcvideo,videodev
- snd_seq_midi           16384  0
- snd_hda_intel          36864  3
- snd_seq_midi_event     16384  1 snd_seq_midi
- snd_hda_codec         135168  4 
snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_intel
- joydev                 20480  0
- input_leds             16384  0
- rtsx_pci_ms            20480  0
- snd_hda_core           73728  7 
snd_hda_codec_realtek,snd_hda_ext_core,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_codec,snd_hda_intel,snd_soc_skl
- snd_rawmidi            32768  1 snd_seq_midi
- btusb                  45056  0
- snd_hwdep              16384  1 snd_hda_codec
- btrtl                  16384  1 btusb
- btbcm                  16384  1 btusb
- serio_raw              16384  0
- cfg80211              565248  3 iwlwifi,mac80211,iwlmvm
- btintel                16384  1 btusb
- memstick               20480  1 rtsx_pci_ms
- bluetooth             520192  9 bnep,btbcm,btrtl,btusb,btintel
- thinkpad_acpi          86016  1
- snd_pcm               106496  8 
snd_hda_ext_core,snd_soc_core,snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel,snd_soc_skl,snd_pcm_dmaengine,snd_hda_core
- snd_seq                69632  2 snd_seq_midi_event,snd_seq_midi
- nvram                  16384  1 thinkpad_acpi
- shpchp                 36864  0
- snd_seq_device         16384  3 snd_seq,snd_rawmidi,snd_seq_midi
- snd_timer              32768  2 snd_pcm,snd_seq
- snd                    81920  20 
snd_hda_codec_realtek,snd_soc_core,snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_pcm,snd_seq,snd_rawmidi,snd_hda_codec_generic,snd_hda_codec,snd_hda_intel,thinkpad_acpi,snd_seq_device,snd_compress
- soundcore              16384  1 snd
- mei_me                 36864  0
- mei                    98304  1 mei_me
- mac_hid                16384  0
- parport_pc             32768  0
- ppdev                  20480  0
- lp                     20480  0
- parport                49152  3 lp,ppdev,parport_pc
- autofs4                40960  2
- drbg                   32768  1
- ansi_cprng             16384  0
- algif_skcipher         20480  0
- af_alg                 16384  1 algif_skcipher
- dm_crypt               28672  1
- rtsx_pci_sdmmc         24576  0
- crct10dif_pclmul       16384  0
- crc32_pclmul           16384  0
- aesni_intel           167936  6
- i915_bpo             1261568  10
- aes_x86_64             20480  1 aesni_intel
- lrw                    16384  1 aesni_intel
- gf128mul               16384  1 lrw
- glue_helper            16384  1 aesni_intel
- ablk_helper            16384  1 aesni_intel
- cryptd                 20480  3 aesni_intel,ablk_helper
- intel_ips              20480  1 i915_bpo
- i2c_algo_bit           16384  1 i915_bpo
- drm_kms_helper        139264  1 i915_bpo
- e1000e                237568  0
- syscopyarea            16384  1 drm_kms_helper
- sysfillrect            16384  1 drm_kms_helper
- ahci                   36864  2
- psmouse               126976  0
- sysimgblt              16384  1 drm_kms_helper
- fb_sys_fops            16384  1 drm_kms_helper
- ptp                    20480  1 e1000e
- drm                   360448  11 i915_bpo,drm_kms_helper
- pps_core               20480  1 ptp
- rtsx_pci               53248  2 rtsx_pci_ms,rtsx_pci_sdmmc
- libahci                32768  1 ahci
- wmi                    20480  0
- video                  40960  2 i915_bpo,thinkpad_acpi
- fjes                   28672  0
- 
- jan@t460s:~$ iwconfig
- wlp4s0    IEEE 802.11abgn  ESSID:"paula"  
-           Mode:Managed  Frequency:2.412 GHz  Access Point: 88:03:55:10:78:F5  
 
-           Bit Rate=1 Mb/s   Tx-Power=22 dBm   
-           Retry short limit:7   RTS thr:off   Fragment thr:off
-           Power Management:off
-           Link Quality=70/70  Signal level=-24 dBm  
-           Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
-           Tx excessive retries:0  Invalid misc:4   Missed beacon:0
- 
- enp0s31f6  no wireless extensions.
- 
- lo        no wireless extensions.
- 
- jan@t460s:~$ rfkill list
- 0: tpacpi_bluetooth_sw: Bluetooth
-         Soft blocked: yes
-         Hard blocked: no
- 2: phy0: Wireless LAN
-         Soft blocked: no
-         Hard blocked: no
- 
- jan@t460s:~$ cat /var/log/syslog
- Apr  6 18:53:33 t460s anacron[802]: Job `cron.daily' terminated
- Apr  6 18:53:33 t460s anacron[802]: Normal exit (1 job run)
- Apr  6 18:53:36 t460s org.freedesktop.Telepathy.AccountManager[1054]: 
(process:1163): GLib-GObject-WARNING **: value "35" of type 'guint' is invalid 
or out of range for property 'gateway-ping-timeout' of type 'guint'
- Apr  6 18:54:33 t460s kernel: [ 1283.602737] wlp4s0: deauthenticated from 
88:03:55:10:78:f5 (Reason: 3=DEAUTH_LEAVING)
- Apr  6 18:53:36 t460s org.freedesktop.Telepathy.AccountManager[1054]: 
(process:1163): GLib-GObject-WARNING **: value "35" of type 'guint' is invalid 
or out of range for property 'gateway-ping-timeout' of type 'guint'
- Apr  6 18:54:33 t460s wpa_supplicant[996]: wlp4s0: CTRL-EVENT-DISCONNECTED 
bssid=88:03:55:10:78:f5 reason=3
- Apr  6 18:54:33 t460s NetworkManager[800]: <warn>  Connection disconnected 
(reason 3)
- Apr  6 18:54:33 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: completed -> disconnected
- Apr  6 18:54:33 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: disconnected -> scanning
- Apr  6 18:54:34 t460s wpa_supplicant[996]: wlp4s0: SME: Trying to 
authenticate with 88:03:55:10:78:f5 (SSID='paula' freq=2412 MHz)
- Apr  6 18:54:34 t460s kernel: [ 1284.486425] wlp4s0: authenticate with 
88:03:55:10:78:f5
- Apr  6 18:54:34 t460s kernel: [ 1284.495038] wlp4s0: send auth to 
88:03:55:10:78:f5 (try 1/3)
- Apr  6 18:54:34 t460s wpa_supplicant[996]: wlp4s0: Trying to associate with 
88:03:55:10:78:f5 (SSID='paula' freq=2412 MHz)
- Apr  6 18:54:34 t460s kernel: [ 1284.500271] wlp4s0: authenticated
- Apr  6 18:54:34 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: scanning -> authenticating
- Apr  6 18:54:34 t460s kernel: [ 1284.503373] wlp4s0: associate with 
88:03:55:10:78:f5 (try 1/3)
- Apr  6 18:54:34 t460s kernel: [ 1284.507440] wlp4s0: RX AssocResp from 
88:03:55:10:78:f5 (capab=0x411 status=0 aid=6)
- Apr  6 18:54:34 t460s kernel: [ 1284.513000] wlp4s0: associated
- Apr  6 18:54:34 t460s wpa_supplicant[996]: wlp4s0: Associated with 
88:03:55:10:78:f5
- Apr  6 18:54:34 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: authenticating -> associating
- Apr  6 18:54:34 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: associating -> 4-way handshake
- Apr  6 18:54:34 t460s wpa_supplicant[996]: wlp4s0: WPA: Key negotiation 
completed with 88:03:55:10:78:f5 [PTK=CCMP GTK=CCMP]
- Apr  6 18:54:34 t460s wpa_supplicant[996]: wlp4s0: CTRL-EVENT-CONNECTED - 
Connection to 88:03:55:10:78:f5 completed [id=0 id_str=]
- Apr  6 18:54:34 t460s org.freedesktop.Telepathy.AccountManager[1054]: 
(process:1163): GLib-GObject-WARNING **: value "35" of type 'guint' is invalid 
or out of range for property 'gateway-ping-timeout' of type 'guint'
- Apr  6 18:54:34 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: 4-way handshake -> completed
- Apr  6 18:55:17 t460s org.freedesktop.Telepathy.AccountManager[1054]: 
(process:1163): GLib-GObject-WARNING **: value "35" of type 'guint' is invalid 
or out of range for property 'gateway-ping-timeout' of type 'guint'
- Apr  6 18:55:59 t460s kernel: [ 1370.155583] wlp4s0: deauthenticated from 
88:03:55:10:78:f5 (Reason: 3=DEAUTH_LEAVING)
- Apr  6 18:55:17 t460s org.freedesktop.Telepathy.AccountManager[1054]: 
(process:1163): GLib-GObject-WARNING **: value "35" of type 'guint' is invalid 
or out of range for property 'gateway-ping-timeout' of type 'guint'
- Apr  6 18:55:59 t460s wpa_supplicant[996]: wlp4s0: CTRL-EVENT-DISCONNECTED 
bssid=88:03:55:10:78:f5 reason=3
- Apr  6 18:55:59 t460s NetworkManager[800]: <warn>  Connection disconnected 
(reason 3)
- Apr  6 18:55:59 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: completed -> disconnected
- Apr  6 18:56:00 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: disconnected -> scanning
- Apr  6 18:56:01 t460s wpa_supplicant[996]: wlp4s0: SME: Trying to 
authenticate with 88:03:55:10:78:f5 (SSID='paula' freq=2412 MHz)
- Apr  6 18:56:01 t460s kernel: [ 1371.274785] wlp4s0: authenticate with 
88:03:55:10:78:f5
- Apr  6 18:56:01 t460s kernel: [ 1371.282632] wlp4s0: send auth to 
88:03:55:10:78:f5 (try 1/3)
- Apr  6 18:56:01 t460s wpa_supplicant[996]: wlp4s0: Trying to associate with 
88:03:55:10:78:f5 (SSID='paula' freq=2412 MHz)
- Apr  6 18:56:01 t460s kernel: [ 1371.285112] wlp4s0: authenticated
- Apr  6 18:56:01 t460s kernel: [ 1371.288591] wlp4s0: associate with 
88:03:55:10:78:f5 (try 1/3)
- Apr  6 18:56:01 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: scanning -> authenticating
- Apr  6 18:56:01 t460s kernel: [ 1371.298720] wlp4s0: RX AssocResp from 
88:03:55:10:78:f5 (capab=0x411 status=0 aid=6)
- Apr  6 18:56:01 t460s wpa_supplicant[996]: wlp4s0: Associated with 
88:03:55:10:78:f5
- Apr  6 18:56:01 t460s kernel: [ 1371.302772] wlp4s0: associated
- Apr  6 18:56:01 t460s org.freedesktop.Telepathy.AccountManager[1054]: 
(process:1163): GLib-GObject-WARNING **: value "35" of type 'guint' is invalid 
or out of range for property 'gateway-ping-timeout' of type 'guint'
- Apr  6 18:56:01 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: authenticating -> associating
- Apr  6 18:56:01 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: associating -> associated
- Apr  6 18:56:01 t460s org.freedesktop.Telepathy.AccountManager[1054]: 
(process:1163): GLib-GObject-WARNING **: value "35" of type 'guint' is invalid 
or out of range for property 'gateway-ping-timeout' of type 'guint'
- Apr  6 18:56:01 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: associated -> 4-way handshake
- Apr  6 18:56:01 t460s wpa_supplicant[996]: wlp4s0: WPA: Key negotiation 
completed with 88:03:55:10:78:f5 [PTK=CCMP GTK=CCMP]
- Apr  6 18:56:01 t460s wpa_supplicant[996]: wlp4s0: CTRL-EVENT-CONNECTED - 
Connection to 88:03:55:10:78:f5 completed [id=0 id_str=]
- Apr  6 18:56:01 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: 4-way handshake -> completed
- Apr  6 18:56:13 t460s org.kde.KScreen[1054]: kscreen: Primary output changed 
from KScreen::Output(Id: 67 , Name: "eDP1" ) ( "eDP1" ) to KScreen::Output(Id: 
67 , Name: "eDP1" ) ( "eDP1" )
- Apr  6 18:56:58 t460s kernel: [ 1428.517743] wlp4s0: deauthenticated from 
88:03:55:10:78:f5 (Reason: 3=DEAUTH_LEAVING)
- Apr  6 18:56:13 t460s org.kde.KScreen[1054]: message repeated 7 times: [ 
kscreen: Primary output changed from KScreen::Output(Id: 67 , Name: "eDP1" ) ( 
"eDP1" ) to KScreen::Output(Id: 67 , Name: "eDP1" ) ( "eDP1" )]
- Apr  6 18:56:58 t460s wpa_supplicant[996]: wlp4s0: CTRL-EVENT-DISCONNECTED 
bssid=88:03:55:10:78:f5 reason=3
- Apr  6 18:56:58 t460s NetworkManager[800]: <warn>  Connection disconnected 
(reason 3)
- Apr  6 18:56:58 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: completed -> disconnected
- Apr  6 18:56:58 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: disconnected -> scanning
- Apr  6 18:56:59 t460s wpa_supplicant[996]: wlp4s0: SME: Trying to 
authenticate with 88:03:55:10:78:f5 (SSID='paula' freq=2412 MHz)
- Apr  6 18:56:59 t460s kernel: [ 1429.405052] wlp4s0: authenticate with 
88:03:55:10:78:f5
- Apr  6 18:56:59 t460s org.freedesktop.Telepathy.AccountManager[1054]: 
(process:1163): GLib-GObject-WARNING **: value "35" of type 'guint' is invalid 
or out of range for property 'gateway-ping-timeout' of type 'guint'
- Apr  6 18:56:59 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: scanning -> authenticating
- Apr  6 18:56:59 t460s wpa_supplicant[996]: wlp4s0: Trying to associate with 
88:03:55:10:78:f5 (SSID='paula' freq=2412 MHz)
- Apr  6 18:56:59 t460s kernel: [ 1429.413161] wlp4s0: send auth to 
88:03:55:10:78:f5 (try 1/3)
- Apr  6 18:56:59 t460s kernel: [ 1429.415024] wlp4s0: authenticated
- Apr  6 18:56:59 t460s org.freedesktop.Telepathy.AccountManager[1054]: 
(process:1163): GLib-GObject-WARNING **: value "35" of type 'guint' is invalid 
or out of range for property 'gateway-ping-timeout' of type 'guint'
- Apr  6 18:56:59 t460s kernel: [ 1429.415827] wlp4s0: associate with 
88:03:55:10:78:f5 (try 1/3)
- Apr  6 18:56:59 t460s org.freedesktop.Telepathy.AccountManager[1054]: 
(process:1163): GLib-GObject-WARNING **: value "35" of type 'guint' is invalid 
or out of range for property 'gateway-ping-timeout' of type 'guint'
- Apr  6 18:56:59 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: authenticating -> associating
- Apr  6 18:56:59 t460s org.freedesktop.Telepathy.AccountManager[1054]: 
(process:1163): GLib-GObject-WARNING **: value "35" of type 'guint' is invalid 
or out of range for property 'gateway-ping-timeout' of type 'guint'
- Apr  6 18:56:59 t460s kernel: [ 1429.425555] wlp4s0: RX AssocResp from 
88:03:55:10:78:f5 (capab=0x411 status=0 aid=6)
- Apr  6 18:56:59 t460s wpa_supplicant[996]: wlp4s0: Associated with 
88:03:55:10:78:f5
- Apr  6 18:56:59 t460s kernel: [ 1429.433805] wlp4s0: associated
- Apr  6 18:56:59 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: associating -> 4-way handshake
- Apr  6 18:56:59 t460s wpa_supplicant[996]: wlp4s0: WPA: Key negotiation 
completed with 88:03:55:10:78:f5 [PTK=CCMP GTK=CCMP]
- Apr  6 18:56:59 t460s wpa_supplicant[996]: wlp4s0: CTRL-EVENT-CONNECTED - 
Connection to 88:03:55:10:78:f5 completed [id=0 id_str=]
- Apr  6 18:56:59 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: 4-way handshake -> completed
- Apr  6 18:57:19 t460s org.freedesktop.Telepathy.AccountManager[1054]: 
(process:1163): GLib-GObject-WARNING **: value "35" of type 'guint' is invalid 
or out of range for property 'gateway-ping-timeout' of type 'guint'
- Apr  6 18:57:56 t460s kernel: [ 1486.907531] wlp4s0: deauthenticated from 
88:03:55:10:78:f5 (Reason: 3=DEAUTH_LEAVING)
- Apr  6 18:57:19 t460s org.freedesktop.Telepathy.AccountManager[1054]: 
(process:1163): GLib-GObject-WARNING **: value "35" of type 'guint' is invalid 
or out of range for property 'gateway-ping-timeout' of type 'guint'
- Apr  6 18:57:56 t460s wpa_supplicant[996]: wlp4s0: CTRL-EVENT-DISCONNECTED 
bssid=88:03:55:10:78:f5 reason=3
- Apr  6 18:57:56 t460s NetworkManager[800]: <warn>  Connection disconnected 
(reason 3)
- Apr  6 18:57:56 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: completed -> disconnected
- Apr  6 18:57:56 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: disconnected -> scanning
- Apr  6 18:57:57 t460s org.kde.kdeconnect[1054]: kdeconnect.core: Broadcasting 
identity packet
- Apr  6 18:57:57 t460s org.freedesktop.Telepathy.AccountManager[1054]: 
(process:1163): GLib-GObject-WARNING **: value "35" of type 'guint' is invalid 
or out of range for property 'gateway-ping-timeout' of type 'guint'
- Apr  6 18:58:03 t460s wpa_supplicant[996]: wlp4s0: SME: Trying to 
authenticate with 88:03:55:10:78:f5 (SSID='paula' freq=2412 MHz)
- Apr  6 18:58:03 t460s kernel: [ 1493.775247] wlp4s0: authenticate with 
88:03:55:10:78:f5
- Apr  6 18:58:03 t460s kernel: [ 1493.786002] wlp4s0: send auth to 
88:03:55:10:78:f5 (try 1/3)
- Apr  6 18:58:03 t460s wpa_supplicant[996]: wlp4s0: Trying to associate with 
88:03:55:10:78:f5 (SSID='paula' freq=2412 MHz)
- Apr  6 18:58:03 t460s kernel: [ 1493.787924] wlp4s0: authenticated
- Apr  6 18:58:03 t460s kernel: [ 1493.790207] wlp4s0: associate with 
88:03:55:10:78:f5 (try 1/3)
- Apr  6 18:58:03 t460s kernel: [ 1493.801463] wlp4s0: RX AssocResp from 
88:03:55:10:78:f5 (capab=0x411 status=0 aid=6)
- Apr  6 18:58:03 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: scanning -> authenticating
- Apr  6 18:58:03 t460s wpa_supplicant[996]: wlp4s0: Associated with 
88:03:55:10:78:f5
- Apr  6 18:58:03 t460s kernel: [ 1493.806486] wlp4s0: associated
- Apr  6 18:58:03 t460s org.freedesktop.Telepathy.AccountManager[1054]: 
(process:1163): GLib-GObject-WARNING **: value "35" of type 'guint' is invalid 
or out of range for property 'gateway-ping-timeout' of type 'guint'
- Apr  6 18:58:03 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: authenticating -> associating
- Apr  6 18:58:03 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: associating -> 4-way handshake
- Apr  6 18:58:03 t460s org.freedesktop.Telepathy.AccountManager[1054]: 
(process:1163): GLib-GObject-WARNING **: value "35" of type 'guint' is invalid 
or out of range for property 'gateway-ping-timeout' of type 'guint'
- Apr  6 18:58:03 t460s wpa_supplicant[996]: wlp4s0: WPA: Key negotiation 
completed with 88:03:55:10:78:f5 [PTK=CCMP GTK=CCMP]
- Apr  6 18:58:03 t460s wpa_supplicant[996]: wlp4s0: CTRL-EVENT-CONNECTED - 
Connection to 88:03:55:10:78:f5 completed [id=0 id_str=]
- Apr  6 18:58:03 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: 4-way handshake -> completed
- Apr  6 18:58:54 t460s kernel: [ 1544.293355] wlp4s0: deauthenticated from 
88:03:55:10:78:f5 (Reason: 3=DEAUTH_LEAVING)
- Apr  6 18:58:54 t460s wpa_supplicant[996]: wlp4s0: CTRL-EVENT-DISCONNECTED 
bssid=88:03:55:10:78:f5 reason=3
- Apr  6 18:58:54 t460s NetworkManager[800]: <warn>  Connection disconnected 
(reason 3)
- Apr  6 18:58:54 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: completed -> disconnected
- Apr  6 18:58:54 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: disconnected -> scanning
- Apr  6 18:58:55 t460s wpa_supplicant[996]: wlp4s0: SME: Trying to 
authenticate with 88:03:55:10:78:f5 (SSID='paula' freq=2412 MHz)
- Apr  6 18:58:55 t460s kernel: [ 1545.292005] wlp4s0: authenticate with 
88:03:55:10:78:f5
- Apr  6 18:58:55 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: scanning -> authenticating
- Apr  6 18:58:55 t460s kernel: [ 1545.299876] wlp4s0: send auth to 
88:03:55:10:78:f5 (try 1/3)
- Apr  6 18:58:55 t460s wpa_supplicant[996]: wlp4s0: Trying to associate with 
88:03:55:10:78:f5 (SSID='paula' freq=2412 MHz)
- Apr  6 18:58:55 t460s kernel: [ 1545.301784] wlp4s0: authenticated
- Apr  6 18:58:55 t460s kernel: [ 1545.305639] wlp4s0: associate with 
88:03:55:10:78:f5 (try 1/3)
- Apr  6 18:58:55 t460s org.freedesktop.Telepathy.AccountManager[1054]: 
(process:1163): GLib-GObject-WARNING **: value "35" of type 'guint' is invalid 
or out of range for property 'gateway-ping-timeout' of type 'guint'
- Apr  6 18:58:55 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: authenticating -> associating
- Apr  6 18:58:55 t460s org.freedesktop.Telepathy.AccountManager[1054]: 
(process:1163): GLib-GObject-WARNING **: value "35" of type 'guint' is invalid 
or out of range for property 'gateway-ping-timeout' of type 'guint'
- Apr  6 18:58:55 t460s kernel: [ 1545.310889] wlp4s0: RX AssocResp from 
88:03:55:10:78:f5 (capab=0x411 status=0 aid=6)
- Apr  6 18:58:55 t460s wpa_supplicant[996]: wlp4s0: Associated with 
88:03:55:10:78:f5
- Apr  6 18:58:55 t460s kernel: [ 1545.319139] wlp4s0: associated
- Apr  6 18:58:55 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: associating -> 4-way handshake
- Apr  6 18:58:55 t460s wpa_supplicant[996]: wlp4s0: WPA: Key negotiation 
completed with 88:03:55:10:78:f5 [PTK=CCMP GTK=CCMP]
- Apr  6 18:58:55 t460s wpa_supplicant[996]: wlp4s0: CTRL-EVENT-CONNECTED - 
Connection to 88:03:55:10:78:f5 completed [id=0 id_str=]
- Apr  6 18:58:55 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: 4-way handshake -> completed
- Apr  6 18:59:17 t460s org.freedesktop.Telepathy.AccountManager[1054]: 
(process:1163): GLib-GObject-WARNING **: value "35" of type 'guint' is invalid 
or out of range for property 'gateway-ping-timeout' of type 'guint'
- Apr  6 18:59:52 t460s kernel: [ 1602.680296] wlp4s0: deauthenticated from 
88:03:55:10:78:f5 (Reason: 3=DEAUTH_LEAVING)
- Apr  6 18:59:17 t460s org.freedesktop.Telepathy.AccountManager[1054]: 
(process:1163): GLib-GObject-WARNING **: value "35" of type 'guint' is invalid 
or out of range for property 'gateway-ping-timeout' of type 'guint'
- Apr  6 18:59:52 t460s wpa_supplicant[996]: wlp4s0: CTRL-EVENT-DISCONNECTED 
bssid=88:03:55:10:78:f5 reason=3
- Apr  6 18:59:52 t460s NetworkManager[800]: <warn>  Connection disconnected 
(reason 3)
- Apr  6 18:59:52 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: completed -> disconnected
- Apr  6 18:59:52 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: disconnected -> scanning
- Apr  6 18:59:55 t460s kernel: [ 1605.367858] wlp4s0: authenticate with 
88:03:55:10:78:f5
- Apr  6 18:59:55 t460s wpa_supplicant[996]: wlp4s0: SME: Trying to 
authenticate with 88:03:55:10:78:f5 (SSID='paula' freq=2412 MHz)
- Apr  6 18:59:55 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: scanning -> authenticating
- Apr  6 18:59:55 t460s kernel: [ 1605.378001] wlp4s0: send auth to 
88:03:55:10:78:f5 (try 1/3)
- Apr  6 18:59:55 t460s kernel: [ 1605.379959] wlp4s0: authenticated
- Apr  6 18:59:55 t460s wpa_supplicant[996]: wlp4s0: Trying to associate with 
88:03:55:10:78:f5 (SSID='paula' freq=2412 MHz)
- Apr  6 18:59:55 t460s org.freedesktop.Telepathy.AccountManager[1054]: 
(process:1163): GLib-GObject-WARNING **: value "35" of type 'guint' is invalid 
or out of range for property 'gateway-ping-timeout' of type 'guint'
- Apr  6 18:59:55 t460s kernel: [ 1605.380163] wlp4s0: associate with 
88:03:55:10:78:f5 (try 1/3)
- Apr  6 18:59:55 t460s kernel: [ 1605.384091] wlp4s0: RX AssocResp from 
88:03:55:10:78:f5 (capab=0x411 status=0 aid=6)
- Apr  6 18:59:55 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: authenticating -> associating
- Apr  6 18:59:55 t460s wpa_supplicant[996]: wlp4s0: Associated with 
88:03:55:10:78:f5
- Apr  6 18:59:55 t460s kernel: [ 1605.394342] wlp4s0: associated
- Apr  6 18:59:55 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: associating -> 4-way handshake
- Apr  6 18:59:55 t460s wpa_supplicant[996]: wlp4s0: WPA: Key negotiation 
completed with 88:03:55:10:78:f5 [PTK=CCMP GTK=CCMP]
- Apr  6 18:59:55 t460s wpa_supplicant[996]: wlp4s0: CTRL-EVENT-CONNECTED - 
Connection to 88:03:55:10:78:f5 completed [id=0 id_str=]
- Apr  6 18:59:55 t460s NetworkManager[800]: <info>  (wlp4s0): supplicant 
interface state: 4-way handshake -> completed
+ - Reconnect to WLAN
+ - Using kernel 4.6 or 4.7 
+ - Restarting NetworkManager and networking service

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https://bugs.launchpad.net/bugs/1566987

Title:
  No internet connection through WLAN although connected to network

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  In a fresh install of Kubuntu 16.04 on a ThinkPad t460s, I can connect
  wireless to the local WLAN, but I don't have an internet connection. A
  ping to the router doesn't work in that case.

  After some minutes, the connection usually (but not always) works.

  A LAN connection through the same router works, too. It seems that the
  problem doesn't occur in every WLAN, but in my home network (using an
  O2 box) it always does.

  The problem is reproducible with a Kubuntu Live CD/USB.

  The following steps did not solve the problem:

  - Reconnect to WLAN
  - Using kernel 4.6 or 4.7 
  - Restarting NetworkManager and networking service

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