当我上网时，我家的互联网偶尔会断线，而当我家其他人上网时则不会发生这种情况，所以这可能是 Ubuntu 的问题导致路由器断线？有人知道这是什么吗？
我在 ThinkPad T430 上使用 Ubuntu 18.04 LTS，路由器是 DrayTek Vigor2760。互联网提供商是 PlusNet，房子位于英国白金汉郡。
$ journalctl --unit=NetworkManager
Jun 25 20:26:57 adam-thinkpad-t430 NetworkManager[3061]: [1529954817.8435] sup-iface[0x55d3dcc67240,wlp3s0]: connection disconnected (reason -4)
Jun 25 20:26:57 adam-thinkpad-t430 NetworkManager[3061]: [1529954817.8757] device (wlp3s0): supplicant interface state: completed -> disconnected
Jun 25 20:26:57 adam-thinkpad-t430 NetworkManager[3061]: [1529954817.9463] device (wlp3s0): supplicant interface state: disconnected -> scanning
Jun 25 20:27:13 adam-thinkpad-t430 NetworkManager[3061]: [1529954833.4532] device (wlp3s0): link timed out.
Jun 25 20:27:13 adam-thinkpad-t430 NetworkManager[3061]: [1529954833.4561] device (wlp3s0): state change: activated -> failed (reason 'ssid-not-found', sys-iface-
Jun 25 20:27:13 adam-thinkpad-t430 NetworkManager[3061]: [1529954833.4726] device (wlp3s0): Activation: failed for connection 'Belkin54g 1'
Jun 25 20:27:13 adam-thinkpad-t430 NetworkManager[3061]: [1529954833.4743] manager: NetworkManager state is now CONNECTED_LOCAL
Jun 25 20:27:13 adam-thinkpad-t430 NetworkManager[3061]: [1529954833.4756] device (wlp3s0): state change: failed -> disconnected (reason 'none', sys-iface-state:
Jun 25 20:27:13 adam-thinkpad-t430 NetworkManager[3061]: [1529954833.5115] dhcp4 (wlp3s0): canceled DHCP transaction, DHCP client pid 24770
Jun 25 20:27:13 adam-thinkpad-t430 NetworkManager[3061]: [1529954833.5115] dhcp4 (wlp3s0): state changed bound -> done
Jun 25 20:27:17 adam-thinkpad-t430 NetworkManager[3061]: [1529954837.2648] device (wlp3s0): supplicant interface state: scanning -> inactive
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.4342] policy: auto-activating connection 'Belkin54g 1'
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.4356] device (wlp3s0): Activation: starting connection 'Belkin54g 1' (a57eefba-4c40-4625-b592
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.4360] device (wlp3s0): state change: disconnected -> prepare (reason 'none', sys-iface-state:
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.4362] manager: NetworkManager state is now CONNECTING
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.4370] device (wlp3s0): state change: prepare -> config (reason 'none', sys-iface-state: 'mana
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.4375] device (wlp3s0): Activation: (wifi) access point 'Belkin54g 1' has security, but secret
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.4376] device (wlp3s0): state change: config -> need-auth (reason 'none', sys-iface-state: 'ma
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.4377] sup-iface[0x55d3dcc67240,wlp3s0]: wps: type pbc start...
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.4425] device (wlp3s0): state change: need-auth -> prepare (reason 'none', sys-iface-state: 'm
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.4474] device (wlp3s0): state change: prepare -> config (reason 'none', sys-iface-state: 'mana
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.4481] device (wlp3s0): Activation: (wifi) connection 'Belkin54g 1' has security, and secrets
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.4481] Config: added 'ssid' value 'Belkin54g'
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.4482] Config: added 'scan_ssid' value '1'
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.4482] Config: added 'bgscan' value 'simple:30:-80:86400'
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.4482] Config: added 'key_mgmt' value 'WPA-PSK'
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.4482] Config: added 'auth_alg' value 'OPEN'
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.4482] Config: added 'psk' value ''
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.4739] device (wlp3s0): supplicant interface state: inactive -> associating
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.4892] device (wlp3s0): supplicant interface state: associating -> 4-way handshake
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.5014] device (wlp3s0): supplicant interface state: 4-way handshake -> completed
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.5014] device (wlp3s0): Activation: (wifi) Stage 2 of 5 (Device Configure) successful. Connec
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.5015] device (wlp3s0): state change: config -> ip-config (reason 'none', sys-iface-state: 'ma
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.5024] dhcp4 (wlp3s0): activation: beginning transaction (timeout in 45 seconds)
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.5060] dhcp4 (wlp3s0): dhclient started with pid 26537
Jun 25 20:27:20 adam-thinkpad-t430 dhclient[26537]: DHCPREQUEST of 192.168.1.11 on wlp3s0 to 255.255.255.255 port 67 (xid=0x7ff27e80)
Jun 25 20:27:20 adam-thinkpad-t430 dhclient[26537]: DHCPACK of 192.168.1.11 from 192.168.1.1
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.5908] dhcp4 (wlp3s0): address 192.168.1.11
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.5908] dhcp4 (wlp3s0): plen 24 (255.255.255.0)
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.5909] dhcp4 (wlp3s0): gateway 192.168.1.1
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.5909] dhcp4 (wlp3s0): lease time 604800
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.5909] dhcp4 (wlp3s0): nameserver '192.168.1.1'
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.5909] dhcp4 (wlp3s0): nameserver '8.8.4.4'
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.5909] dhcp4 (wlp3s0): state changed unknown -> bound
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.5946] device (wlp3s0): state change: ip-config -> ip-check (reason 'none', sys-iface-state: '
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.5957] device (wlp3s0): state change: ip-check -> secondaries (reason 'none', sys-iface-state:
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.5960] device (wlp3s0): state change: secondaries -> activated (reason 'none', sys-iface-state
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.5962] manager: NetworkManager state is now CONNECTED_LOCAL
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.6150] manager: NetworkManager state is now CONNECTED_SITE
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.6151] policy: set 'Belkin54g 1' (wlp3s0) as default for IPv4 routing and DNS
Jun 25 20:27:20 adam-thinkpad-t430 NetworkManager[3061]: [1529954840.6157] device (wlp3s0): Activation: successful, device activated.
Jun 25 20:27:20 adam-thinkpad-t430 dhclient[26537]: bound to 192.168.1.11 -- renewal in 291393 seconds.
Jun 25 20:30:27 adam-thinkpad-t430 NetworkManager[3061]: [1529955027.6802] manager: NetworkManager state is now CONNECTED_GLOBAL