just FYI: 4.14.rc2 networking failure seems to be caused by dhcp client crash. Where to submit bug report for this? Sep 25 21:07:47 p5520 nm-applet[3178]: gtk_widget_destroy: assertion 'GTK_IS_WIDGET (widget)' failed Sep 25 21:07:48 p5520 wpa_supplicant[1521]: wlp2s0: SME: Trying to authenticate with 90:5c:44:98:88:43 (SSID='UPCFB73B8F' freq=5500 MHz) Sep 25 21:07:48 p5520 kernel: [ 87.302852] wlp2s0: authenticate with 90:5c:44:98:88:43 Sep 25 21:07:48 p5520 NetworkManager[1133]: [1506366468.3216] device (wlp2s0): supplicant interface state: scanning -> authenticating Sep 25 21:07:48 p5520 kernel: [ 87.309769] wlp2s0: send auth to 90:5c:44:98:88:43 (try 1/3) Sep 25 21:07:48 p5520 nm-applet[3178]: Can't set a parent on widget which has a parent Sep 25 21:07:48 p5520 wpa_supplicant[1521]: wlp2s0: Trying to associate with 90:5c:44:98:88:43 (SSID='UPCFB73B8F' freq=5500 MHz) Sep 25 21:07:48 p5520 kernel: [ 87.332279] wlp2s0: authenticated Sep 25 21:07:48 p5520 kernel: [ 87.333039] wlp2s0: associating with AP with corrupt probe response Sep 25 21:07:48 p5520 kernel: [ 87.336133] wlp2s0: associate with 90:5c:44:98:88:43 (try 1/3) Sep 25 21:07:48 p5520 NetworkManager[1133]: [1506366468.3494] device (wlp2s0): supplicant interface state: authenticating -> associating Sep 25 21:07:48 p5520 nm-applet[3178]: gtk_widget_destroy: assertion 'GTK_IS_WIDGET (widget)' failed Sep 25 21:07:48 p5520 kernel: [ 87.374203] wlp2s0: RX AssocResp from 90:5c:44:98:88:43 (capab=0x511 status=0 aid=2) Sep 25 21:07:48 p5520 kernel: [ 87.376217] wlp2s0: associated Sep 25 21:07:48 p5520 nm-applet[3178]: gtk_widget_destroy: assertion 'GTK_IS_WIDGET (widget)' failed Sep 25 21:07:48 p5520 wpa_supplicant[1521]: wlp2s0: Associated with 90:5c:44:98:88:43 Sep 25 21:07:48 p5520 kernel: [ 87.376544] IPv6: ADDRCONF(NETDEV_CHANGE): wlp2s0: link becomes ready Sep 25 21:07:48 p5520 NetworkManager[1133]: [1506366468.3949] device (wlp2s0): supplicant interface state: associating -> associated Sep 25 21:07:48 p5520 NetworkManager[1133]: [1506366468.4180] device (wlp2s0): supplicant interface state: associated -> 4-way handshake Sep 25 21:07:48 p5520 wpa_supplicant[1521]: wlp2s0: WPA: Key negotiation completed with 90:5c:44:98:88:43 [PTK=CCMP GTK=CCMP] Sep 25 21:07:48 p5520 wpa_supplicant[1521]: wlp2s0: CTRL-EVENT-CONNECTED - Connection to 90:5c:44:98:88:43 completed [id=0 id_str=] Sep 25 21:07:48 p5520 NetworkManager[1133]: [1506366468.4255] device (wlp2s0): supplicant interface state: 4-way handshake -> completed Sep 25 21:07:48 p5520 NetworkManager[1133]: [1506366468.4257] device (wlp2s0): Activation: (wifi) Stage 2 of 5 (Device Configure) successful. Connected to wireless network 'UPCFB73B8F'. Sep 25 21:07:48 p5520 NetworkManager[1133]: [1506366468.4260] device (wlp2s0): state change: config -> ip-config (reason 'none') [50 70 0] Sep 25 21:07:48 p5520 NetworkManager[1133]: [1506366468.4278] dhcp4 (wlp2s0): activation: beginning transaction (timeout in 45 seconds) Sep 25 21:07:48 p5520 NetworkManager[1133]: [1506366468.4354] dhcp4 (wlp2s0): dhclient started with pid 3528 Sep 25 21:07:48 p5520 kernel: [ 87.429289] audit: type=1400 audit(1506366468.435:156): apparmor="DENIED" operation="create" profile="/sbin/dhclient" pid=3528 comm="dhclient" family="unix" sock_type="dgram" protocol=0 requested_mask="create" denied_mask="create" Sep 25 21:07:48 p5520 kernel: [ 87.430998] audit: type=1400 audit(1506366468.435:157): apparmor="DENIED" operation="create" profile="/sbin/dhclient" pid=3528 comm="dhclient" family="unix" sock_type="stream" protocol=0 requested_mask="create" denied_mask="create" Sep 25 21:07:48 p5520 kernel: [ 87.431007] audit: type=1400 audit(1506366468.435:158): apparmor="DENIED" operation="create" profile="/sbin/dhclient" pid=3528 comm="dhclient" family="unix" sock_type="stream" protocol=0 requested_mask="create" denied_mask="create" Sep 25 21:07:48 p5520 kernel: [ 87.443292] audit: type=1400 audit(1506366468.447:159): apparmor="DENIED" operation="create" profile="/usr/lib/NetworkManager/nm-dhcp-helper" pid=3529 comm="nm-dhcp-helper" family="unix" sock_type="stream" protocol=0 requested_mask="create" denied_mask="create" Sep 25 21:07:48 p5520 NetworkManager[1133]: [1506366468.4560] dhcp4 (wlp2s0): client pid 3528 killed by signal 15 Sep 25 21:07:48 p5520 NetworkManager[1133]: [1506366468.4562] dhcp4 (wlp2s0): state changed unknown -> fail Sep 25 21:07:48 p5520 NetworkManager[1133]: [1506366468.4566] dhcp4 (wlp2s0): canceled DHCP transaction Sep 25 21:07:48 p5520 NetworkManager[1133]: [1506366468.4566] dhcp4 (wlp2s0): state changed fail -> done