I have the same problem on Artful. Here's the journal when trying to activate the hotspot (connection name is "Hotspot"):
Nov 29 18:57:14 vesho systemd[1]: Reloading OpenBSD Secure Shell server. Nov 29 18:57:14 vesho sshd[1245]: Received SIGHUP; restarting. Nov 29 18:57:14 vesho systemd[1]: Reloaded OpenBSD Secure Shell server. Nov 29 18:57:14 vesho sshd[1245]: Server listening on 0.0.0.0 port 22. Nov 29 18:57:14 vesho sshd[1245]: Server listening on :: port 22. Nov 29 18:57:23 vesho wpa_supplicant[1439]: p2p-dev-wlp2s0: CTRL-EVENT-REGDOM-CHANGE init=BEACON_HINT type=UNKNOWN Nov 29 18:57:24 vesho systemd[1]: Reloading OpenBSD Secure Shell server. Nov 29 18:57:24 vesho sshd[1245]: Received SIGHUP; restarting. Nov 29 18:57:24 vesho systemd[1]: Reloaded OpenBSD Secure Shell server. Nov 29 18:57:24 vesho sshd[1245]: Server listening on 0.0.0.0 port 22. Nov 29 18:57:24 vesho sshd[1245]: Server listening on :: port 22. Nov 29 18:57:26 vesho NetworkManager[1040]: <info> [1511974646.0567] keyfile: update /etc/NetworkManager/system-connections/Hotspot (6d467c9a-09c0-4c0e-a7e6-6ee4c7e1cdf2,"Hotspot") Nov 29 18:57:26 vesho NetworkManager[1040]: <info> [1511974646.0574] audit: op="connection-update" uuid="6d467c9a-09c0-4c0e-a7e6-6ee4c7e1cdf2" name="Hotspot" args="802-11-wireless-security.key-mgmt,802-11-wireless-security.psk-flags" pid=26521 uid=1000 result="success" Nov 29 18:57:29 vesho NetworkManager[1040]: <info> [1511974649.9915] device (wlp2s0): disconnecting for new activation request. Nov 29 18:57:29 vesho NetworkManager[1040]: <info> [1511974649.9916] device (wlp2s0): state change: activated -> deactivating (reason 'new-activation', internal state 'managed') Nov 29 18:57:29 vesho NetworkManager[1040]: <info> [1511974649.9942] audit: op="connection-activate" uuid="6d467c9a-09c0-4c0e-a7e6-6ee4c7e1cdf2" name="Hotspot" pid=3181 uid=1000 result="success" Nov 29 18:57:29 vesho NetworkManager[1040]: <info> [1511974649.9963] device (wlp2s0): state change: deactivating -> disconnected (reason 'new-activation', internal state 'managed') Nov 29 18:57:29 vesho avahi-daemon[967]: Withdrawing address record for 2001:470:1f09::XXXX on wlp2s0. Nov 29 18:57:29 vesho avahi-daemon[967]: Leaving mDNS multicast group on interface wlp2s0.IPv6 with address 2001:470:1f09::XXXX. Nov 29 18:57:30 vesho avahi-daemon[967]: Joining mDNS multicast group on interface wlp2s0.IPv6 with address 2001:470:1f09::XXXX. Nov 29 18:57:30 vesho avahi-daemon[967]: Withdrawing address record for 2001:470:1f09::XXXX on wlp2s0. Nov 29 18:57:30 vesho avahi-daemon[967]: Leaving mDNS multicast group on interface wlp2s0.IPv6 with address 2001:470:1f09::XXXX. Nov 29 18:57:30 vesho NetworkManager[1040]: <info> [1511974650.0110] dhcp4 (wlp2s0): canceled DHCP transaction, DHCP client pid 27865 Nov 29 18:57:30 vesho NetworkManager[1040]: <info> [1511974650.0110] dhcp4 (wlp2s0): state changed bound -> done Nov 29 18:57:30 vesho avahi-daemon[967]: Joining mDNS multicast group on interface wlp2s0.IPv6 with address fe80::fb7e:9fad:d4f7:113a. Nov 29 18:57:30 vesho kernel: wlp2s0: deauthenticating from b8:a3:86:b2:52:60 by local choice (Reason: 3=DEAUTH_LEAVING) Nov 29 18:57:30 vesho wpa_supplicant[1439]: wlp2s0: CTRL-EVENT-DISCONNECTED bssid=b8:a3:86:b2:52:60 reason=3 locally_generated=1 Nov 29 18:57:30 vesho systemd-networkd[792]: wlp2s0: Lost carrier Nov 29 18:57:30 vesho systemd-timesyncd[781]: Network configuration changed, trying to establish connection. Nov 29 18:57:30 vesho avahi-daemon[967]: Registering new address record for fe80::fb7e:9fad:d4f7:113a on wlp2s0.*. Nov 29 18:57:30 vesho avahi-daemon[967]: Withdrawing address record for fe80::fb7e:9fad:d4f7:113a on wlp2s0. Nov 29 18:57:30 vesho avahi-daemon[967]: Leaving mDNS multicast group on interface wlp2s0.IPv6 with address fe80::fb7e:9fad:d4f7:113a. Nov 29 18:57:30 vesho avahi-daemon[967]: Interface wlp2s0.IPv6 no longer relevant for mDNS. Nov 29 18:57:30 vesho avahi-daemon[967]: Withdrawing address record for 172.18.1.122 on wlp2s0. Nov 29 18:57:30 vesho avahi-daemon[967]: Leaving mDNS multicast group on interface wlp2s0.IPv4 with address 172.18.1.122. Nov 29 18:57:30 vesho avahi-daemon[967]: Interface wlp2s0.IPv4 no longer relevant for mDNS. Nov 29 18:57:30 vesho wpa_supplicant[1439]: p2p-dev-wlp2s0: CTRL-EVENT-REGDOM-CHANGE init=CORE type=WORLD Nov 29 18:57:30 vesho NetworkManager[1040]: <info> [1511974650.0494] device (wlp2s0): Activation: starting connection 'Hotspot' (6d467c9a-09c0-4c0e-a7e6-6ee4c7e1cdf2) Nov 29 18:57:30 vesho NetworkManager[1040]: <warn> [1511974650.0515] sup-iface[0x55ee1ea4a020,wlp2s0]: connection disconnected (reason -3) Nov 29 18:57:30 vesho systemd[1]: Starting systemd-resolved-update-resolvconf.service... Nov 29 18:57:30 vesho NetworkManager[1040]: <info> [1511974650.0524] device (wlp2s0): supplicant interface state: completed -> disconnected Nov 29 18:57:30 vesho NetworkManager[1040]: <info> [1511974650.0543] device (wlp2s0): state change: disconnected -> prepare (reason 'none', internal state 'managed') Nov 29 18:57:30 vesho nm-dispatcher[27505]: req:4 'down' [wlp2s0]: new request (2 scripts) Nov 29 18:57:30 vesho nm-dispatcher[27505]: req:4 'down' [wlp2s0]: start running ordered scripts... Nov 29 18:57:30 vesho NetworkManager[1040]: <info> [1511974650.0596] device (wlp2s0): state change: prepare -> config (reason 'none', internal state 'managed') Nov 29 18:57:30 vesho systemd[1]: Started systemd-resolved-update-resolvconf.service. Nov 29 18:57:30 vesho NetworkManager[1040]: <info> [1511974650.0707] device (wlp2s0): Activation: (wifi) connection 'Hotspot' requires no security. No secrets needed. Nov 29 18:57:30 vesho NetworkManager[1040]: <info> [1511974650.0707] Config: added 'ssid' value 'veshoing' Nov 29 18:57:30 vesho NetworkManager[1040]: <info> [1511974650.0708] Config: added 'mode' value '2' Nov 29 18:57:30 vesho NetworkManager[1040]: <info> [1511974650.0708] Config: added 'frequency' value '5190' Nov 29 18:57:30 vesho NetworkManager[1040]: <info> [1511974650.0708] Config: added 'freq_list' value '5190' Nov 29 18:57:30 vesho NetworkManager[1040]: <info> [1511974650.0708] Config: added 'key_mgmt' value 'NONE' Nov 29 18:57:30 vesho systemd[1]: Starting systemd-resolved-update-resolvconf.service... Nov 29 18:57:30 vesho kernel: IPv6: ADDRCONF(NETDEV_UP): wlp2s0: link is not ready Nov 29 18:57:30 vesho wpa_supplicant[1439]: wlp2s0: Failed to start AP functionality Nov 29 18:57:30 vesho kernel: IPv6: ADDRCONF(NETDEV_UP): wlp2s0: link is not ready Nov 29 18:57:30 vesho kernel: IPv6: ADDRCONF(NETDEV_UP): wlp2s0: link is not ready Nov 29 18:57:30 vesho systemd[1]: Started systemd-resolved-update-resolvconf.service. Nov 29 18:57:30 vesho systemd-timesyncd[781]: Synchronized to time server 91.189.89.198:123 (ntp.ubuntu.com). Nov 29 18:57:30 vesho systemd-timesyncd[781]: Network configuration changed, trying to establish connection. Nov 29 18:57:30 vesho kernel: IPv6: ADDRCONF(NETDEV_UP): wlp2s0: link is not ready Nov 29 18:57:30 vesho wpa_supplicant[1439]: wlp2s0: Failed to start AP functionality Nov 29 18:57:30 vesho systemd[1]: Starting systemd-resolved-update-resolvconf.service... Nov 29 18:57:30 vesho systemd[1]: Started systemd-resolved-update-resolvconf.service. Nov 29 18:57:30 vesho systemd-timesyncd[781]: Synchronized to time server 91.189.89.198:123 (ntp.ubuntu.com). Nov 29 18:57:54 vesho NetworkManager[1040]: <warn> [1511974674.9480] device (wlp2s0): Activation: (wifi) Hotspot network creation took too long, failing activation Nov 29 18:57:54 vesho NetworkManager[1040]: <info> [1511974674.9481] device (wlp2s0): state change: config -> failed (reason 'supplicant-timeout', internal state 'managed') Nov 29 18:57:54 vesho NetworkManager[1040]: <warn> [1511974674.9492] device (wlp2s0): Activation: failed for connection 'Hotspot' Nov 29 18:57:54 vesho NetworkManager[1040]: <info> [1511974674.9504] device (wlp2s0): state change: failed -> disconnected (reason 'none', internal state 'managed') Nov 29 18:57:54 vesho kernel: IPv6: ADDRCONF(NETDEV_UP): wlp2s0: link is not ready -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/1579512 Title: Hotspot Access Point mode fails for 802.11a (5GHz) band Status in NetworkManager: Incomplete Status in network-manager package in Ubuntu: Triaged Bug description: On a clean 16.04 amd64 install a Managed mode Access Point 'Hotspot' fails to initialize when the frequency band is set to 802.11a 5GHz. "Automatic" or "2.4GHz" both work (using 802.11g). $ lspci -nnk -s 02:00.0 02:00.0 Network controller [0280]: Intel Corporation Wireless 7265 [8086:095a] (rev 59) Subsystem: Intel Corporation Dual Band Wireless-AC 7265 [8086:5100] Kernel driver in use: iwlwifi Kernel modules: iwlwifi $ journalctl -u NetworkManager.service ... [1462706989.5477] (wlp2s0): using nl80211 for WiFi device control [1462706989.5562] device (wlp2s0): driver supports Access Point (AP) mode ... [1462708489.5782] Config: added 'ssid' value 'TJ' [1462708489.5782] Config: added 'mode' value '2' [1462708489.5782] Config: added 'frequency' value '5180' [1462708489.5783] Config: added 'freq_list' value '5035 5040 5045 5055 5060 5080 5170 5180 5190 5200 5210 5220 5230 5240 5250 5260 5280 5290 5300 5320 5500 5520 5540 5560 5580 5600 5620 5640 5660 5680 5700 5745 5760 5765 5785 5800 5805 5825 4915 4920 4925 4935 4945 4960 4980' [1462708489.5783] Config: added 'key_mgmt' value 'WPA-PSK' [1462708489.5783] Config: added 'psk' value '<omitted>' [1462708489.5966] sup-iface[0x16a8ac0,wlp2s0]: config: set interface ap_scan to 2 [1462708515.0203] device (wlp2s0): Activation: (wifi) Hotspot network creation took too long, failing activation [1462708515.0204] device (wlp2s0): state change: config -> failed (reason 'supplicant-timeout') [50 120 11] [1462708515.0207] manager: NetworkManager state is now DISCONNECTED ... 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