我在 ThinkPad T400 上运行 Ubuntu 20.04.1。每次我启动计算机时，它都会尝试连接到我的路由器 (AVM FRITZ!Box 7490)，然后连接失败多次建立连接。大约两分钟后即可建立连接。以下是系统日志的摘录。
kernel: [ 205.048521] wlp3s0: deauthenticating from 34:31:c4:3b:9a:06 by local choice (Reason: 3=DEAUTH_LEAVING)
wpa_supplicant[1109]: wlp3s0: CTRL-EVENT-DISCONNECTED bssid=34:31:c4:3b:9a:06 reason=3 locally_generated=1
wpa_supplicant[1109]: wlp3s0: CTRL-EVENT-REGDOM-CHANGE init=CORE type=WORLD
NetworkManager[4054]: <warn> [1610103773.5309] sup-iface[0x5596cafd4900,wlp3s0]: connection disconnected (reason -3)
NetworkManager[4054]: <info> [1610103773.5310] device (wlp3s0): supplicant interface state: completed -> disconnected
dbus-daemon[1049]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service' requested by ':1.108' (uid=0 pid=4054 comm="/usr/sbin/NetworkManager --no-daemon " label="unconfined")
systemd[1]: Starting Network Manager Script Dispatcher Service...
dbus-daemon[1049]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
systemd[1]: Started Network Manager Script Dispatcher Service.
NetworkManager[4054]: <info> [1610103776.3762] policy: auto-activating connection 'MyRouter' (b1eb0a15-7618-4605-8ea5-4d047fa58ed9)
NetworkManager[4054]: <info> [1610103776.3782] device (wlp3s0): Activation: starting connection 'MyRouter' (b1eb0a15-7618-4605-8ea5-4d047fa58ed9)
NetworkManager[4054]: <info> [1610103776.3825] device (wlp3s0): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
NetworkManager[4054]: <info> [1610103776.3835] manager: NetworkManager state is now CONNECTING
NetworkManager[4054]: <info> [1610103776.3891] device (wlp3s0): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
NetworkManager[4054]: <info> [1610103776.3947] device (wlp3s0): Activation: (wifi) access point 'MyRouter' has security, but secrets are required.
NetworkManager[4054]: <info> [1610103776.3979] device (wlp3s0): state change: config -> need-auth (reason 'none', sys-iface-state: 'managed')
NetworkManager[4054]: <info> [1610103776.3986] sup-iface[0x5596cafd4900,wlp3s0]: wps: type pbc start...
NetworkManager[4054]: <info> [1610103776.4058] device (wlp3s0): state change: need-auth -> prepare (reason 'none', sys-iface-state: 'managed')
NetworkManager[4054]: <info> [1610103776.4168] device (wlp3s0): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
NetworkManager[4054]: <info> [1610103776.4177] device (wlp3s0): Activation: (wifi) connection 'MyRouter' has security, and secrets exist. No new secrets needed.
NetworkManager[4054]: <info> [1610103776.4178] Config: added 'ssid' value 'MyRouter'
NetworkManager[4054]: <info> [1610103776.4178] Config: added 'scan_ssid' value '1'
NetworkManager[4054]: <info> [1610103776.4178] Config: added 'bgscan' value 'simple:30:-70:86400'
NetworkManager[4054]: <info> [1610103776.4178] Config: added 'key_mgmt' value 'WPA-PSK WPA-PSK-SHA256 FT-PSK'
NetworkManager[4054]: <info> [1610103776.4179] Config: added 'auth_alg' value 'OPEN'
NetworkManager[4054]: <info> [1610103776.4179] Config: added 'psk' value '<hidden>'
wpa_supplicant[1109]: wlp3s0: SME: Trying to authenticate with 34:31:c4:3b:9a:06 (SSID='MyRouter' freq=5500 MHz)
kernel: [ 207.979287] wlp3s0: authenticate with 34:31:c4:3b:9a:06
kernel: [ 207.981927] wlp3s0: send auth to 34:31:c4:3b:9a:06 (try 1/3)
NetworkManager[4054]: <info> [1610103776.4528] device (wlp3s0): supplicant interface state: disconnected -> authenticating
wpa_supplicant[1109]: wlp3s0: Trying to associate with 34:31:c4:3b:9a:06 (SSID='MyRouter' freq=5500 MHz)
kernel: [ 208.064412] wlp3s0: authenticated
kernel: [ 208.065382] wlp3s0: associate with 34:31:c4:3b:9a:06 (try 1/3)
NetworkManager[4054]: <info> [1610103776.5334] device (wlp3s0): supplicant interface state: authenticating -> associating
kernel: [ 208.068463] wlp3s0: RX AssocResp from 34:31:c4:3b:9a:06 (capab=0x1511 status=0 aid=3)
wpa_supplicant[1109]: wlp3s0: Associated with 34:31:c4:3b:9a:06
wpa_supplicant[1109]: wlp3s0: CTRL-EVENT-SUBNET-STATUS-UPDATE status=0
wpa_supplicant[1109]: wlp3s0: CTRL-EVENT-REGDOM-CHANGE init=COUNTRY_IE type=COUNTRY alpha2=DE
kernel: [ 208.071020] wlp3s0: associated
NetworkManager[4054]: <info> [1610103776.5452] device (wlp3s0): supplicant interface state: associating -> associated
NetworkManager[4054]: <info> [1610103776.5529] device (wlp3s0): supplicant interface state: associated -> 4-way handshake
kernel: [ 208.165305] wlp3s0: Limiting TX power to 27 (30 - 3) dBm as advertised by 34:31:c4:3b:9a:06
wpa_supplicant[1109]: wlp3s0: WPA: Key negotiation completed with 34:31:c4:3b:9a:06 [PTK=CCMP GTK=CCMP]
wpa_supplicant[1109]: wlp3s0: CTRL-EVENT-CONNECTED - Connection to 34:31:c4:3b:9a:06 completed [id=0 id_str=]
NetworkManager[4054]: <info> [1610103776.6520] device (wlp3s0): supplicant interface state: 4-way handshake -> completed
NetworkManager[4054]: <info> [1610103776.6522] device (wlp3s0): Activation: (wifi) Stage 2 of 5 (Device Configure) successful. Connected to wireless network "MyRouter"
NetworkManager[4054]: <info> [1610103776.6525] device (wlp3s0): state change: config -> ip-config (reason 'none', sys-iface-state: 'managed')
NetworkManager[4054]: <info> [1610103776.6534] dhcp4 (wlp3s0): activation: beginning transaction (timeout in 45 seconds)
avahi-daemon[1044]: Joining mDNS multicast group on interface wlp3s0.IPv6 with address fe80::3ced:f668:f825:5de4.
avahi-daemon[1044]: New relevant interface wlp3s0.IPv6 for mDNS.
avahi-daemon[1044]: Registering new address record for fe80::3ced:f668:f825:5de4 on wlp3s0.*.
wpa_supplicant[1109]: wlp3s0: CTRL-EVENT-SIGNAL-CHANGE above=1 signal=-39 noise=9999 txrate=6000
systemd[1]: NetworkManager-dispatcher.service: Succeeded.
NetworkManager[4054]: <warn> [1610103821.4700] dhcp4 (wlp3s0): request timed out
NetworkManager[4054]: <info> [1610103821.4701] dhcp4 (wlp3s0): state changed unknown -> timeout
NetworkManager[4054]: <info> [1610103821.4703] device (wlp3s0): state change: ip-config -> failed (reason 'ip-config-unavailable', sys-iface-state: 'managed')
NetworkManager[4054]: <info> [1610103821.4738] manager: NetworkManager state is now DISCONNECTED
NetworkManager[4054]: <warn> [1610103821.4883] device (wlp3s0): Activation: failed for connection 'MyRouter'
NetworkManager[4054]: <info> [1610103821.4890] device (wlp3s0): state change: failed -> disconnected (reason 'none', sys-iface-state: 'managed')
avahi-daemon[1044]: Withdrawing address record for fe80::3ced:f668:f825:5de4 on wlp3s0.
avahi-daemon[1044]: Leaving mDNS multicast group on interface wlp3s0.IPv6 with address fe80::3ced:f668:f825:5de4.
avahi-daemon[1044]: Interface wlp3s0.IPv6 no longer relevant for mDNS.
NetworkManager[4054]: <info> [1610103821.5138] dhcp4 (wlp3s0): canceled DHCP transaction
NetworkManager[4054]: <info> [1610103821.5138] dhcp4 (wlp3s0): state changed timeout -> done
kernel: [ 253.061206] wlp3s0: deauthenticating from 34:31:c4:3b:9a:06 by local choice (Reason: 3=DEAUTH_LEAVING)
wpa_supplicant[1109]: wlp3s0: CTRL-EVENT-DISCONNECTED bssid=34:31:c4:3b:9a:06 reason=3 locally_generated=1
wpa_supplicant[1109]: wlp3s0: CTRL-EVENT-REGDOM-CHANGE init=CORE type=WORLD
dbus-daemon[1049]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service' requested by ':1.108' (uid=0 pid=4054 comm="/usr/sbin/NetworkManager --no-daemon " label="unconfined")
kdeconnectd.desktop[2328]: "No such interface “org.freedesktop.DBus.Properties” on object at path /org/freedesktop/NetworkManager/ActiveConnection/3"
systemd[1]: Starting Network Manager Script Dispatcher Service...
NetworkManager[4054]: <warn> [1610103821.5696] sup-iface[0x5596cafd4900,wlp3s0]: connection disconnected (reason -3)
NetworkManager[4054]: <info> [1610103821.5697] device (wlp3s0): supplicant interface state: completed -> disconnected
dbus-daemon[1049]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
systemd[1]: Started Network Manager Script Dispatcher Service.
NetworkManager[4054]: <info> [1610103824.4015] policy: auto-activating connection 'MyRouter' (b1eb0a15-7618-4605-8ea5-4d047fa58ed9)
NetworkManager[4054]: <info> [1610103824.4023] device (wlp3s0): Activation: starting connection 'MyRouter' (b1eb0a15-7618-4605-8ea5-4d047fa58ed9)
NetworkManager[4054]: <info> [1610103824.4024] device (wlp3s0): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
NetworkManager[4054]: <info> [1610103824.4029] manager: NetworkManager state is now CONNECTING
NetworkManager[4054]: <info> [1610103824.4035] device (wlp3s0): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
NetworkManager[4054]: <info> [1610103824.4043] device (wlp3s0): Activation: (wifi) access point 'MyRouter' has security, but secrets are required.
NetworkManager[4054]: <info> [1610103824.4043] device (wlp3s0): state change: config -> need-auth (reason 'none', sys-iface-state: 'managed')
NetworkManager[4054]: <info> [1610103824.4047] sup-iface[0x5596cafd4900,wlp3s0]: wps: type pbc start...
NetworkManager[4054]: <info> [1610103824.4086] device (wlp3s0): state change: need-auth -> prepare (reason 'none', sys-iface-state: 'managed')
NetworkManager[4054]: <info> [1610103824.4094] device (wlp3s0): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
NetworkManager[4054]: <info> [1610103824.4104] device (wlp3s0): Activation: (wifi) connection 'MyRouter' has security, and secrets exist. No new secrets needed.
NetworkManager[4054]: <info> [1610103824.4105] Config: added 'ssid' value 'MyRouter'
NetworkManager[4054]: <info> [1610103824.4105] Config: added 'scan_ssid' value '1'
NetworkManager[4054]: <info> [1610103824.4105] Config: added 'bgscan' value 'simple:30:-70:86400'
NetworkManager[4054]: <info> [1610103824.4106] Config: added 'key_mgmt' value 'WPA-PSK WPA-PSK-SHA256 FT-PSK'
NetworkManager[4054]: <info> [1610103824.4106] Config: added 'auth_alg' value 'OPEN'
NetworkManager[4054]: <info> [1610103824.4106] Config: added 'psk' value '<hidden>'
wpa_supplicant[1109]: wlp3s0: SME: Trying to authenticate with f0:b0:14:42:df:e4 (SSID='MyRouter' freq=5500 MHz)
kernel: [ 256.021600] wlp3s0: authenticate with f0:b0:14:42:df:e4
kernel: [ 256.023965] wlp3s0: send auth to f0:b0:14:42:df:e4 (try 1/3)
NetworkManager[4054]: <info> [1610103824.4947] device (wlp3s0): supplicant interface state: disconnected -> authenticating
wpa_supplicant[1109]: wlp3s0: Trying to associate with f0:b0:14:42:df:e4 (SSID='MyRouter' freq=5500 MHz)
NetworkManager[4054]: <info> [1610103824.5314] device (wlp3s0): supplicant interface state: authenticating -> associating
kernel: [ 256.062081] wlp3s0: authenticated
kernel: [ 256.069507] wlp3s0: associate with f0:b0:14:42:df:e4 (try 1/3)
kernel: [ 256.072007] wlp3s0: RX AssocResp from f0:b0:14:42:df:e4 (capab=0x1511 status=0 aid=1)
wpa_supplicant[1109]: wlp3s0: Associated with f0:b0:14:42:df:e4
wpa_supplicant[1109]: wlp3s0: CTRL-EVENT-SUBNET-STATUS-UPDATE status=0
wpa_supplicant[1109]: wlp3s0: CTRL-EVENT-REGDOM-CHANGE init=COUNTRY_IE type=COUNTRY alpha2=DE
kernel: [ 256.074602] wlp3s0: associated
NetworkManager[4054]: <info> [1610103824.5484] device (wlp3s0): supplicant interface state: associating -> associated
NetworkManager[4054]: <info> [1610103824.5566] device (wlp3s0): supplicant interface state: associated -> 4-way handshake
kernel: [ 256.162912] wlp3s0: Limiting TX power to 27 (30 - 3) dBm as advertised by f0:b0:14:42:df:e4
wpa_supplicant[1109]: wlp3s0: WPA: Key negotiation completed with f0:b0:14:42:df:e4 [PTK=CCMP GTK=CCMP]
wpa_supplicant[1109]: wlp3s0: CTRL-EVENT-CONNECTED - Connection to f0:b0:14:42:df:e4 completed [id=0 id_str=]
NetworkManager[4054]: <info> [1610103824.6504] device (wlp3s0): supplicant interface state: 4-way handshake -> completed
NetworkManager[4054]: <info> [1610103824.6505] device (wlp3s0): Activation: (wifi) Stage 2 of 5 (Device Configure) successful. Connected to wireless network "MyRouter"
NetworkManager[4054]: <info> [1610103824.6511] device (wlp3s0): state change: config -> ip-config (reason 'none', sys-iface-state: 'managed')
NetworkManager[4054]: <info> [1610103824.6523] dhcp4 (wlp3s0): activation: beginning transaction (timeout in 45 seconds)
avahi-daemon[1044]: Joining mDNS multicast group on interface wlp3s0.IPv6 with address fe80::3ced:f668:f825:5de4.
avahi-daemon[1044]: New relevant interface wlp3s0.IPv6 for mDNS.
avahi-daemon[1044]: Registering new address record for fe80::3ced:f668:f825:5de4 on wlp3s0.*.
NetworkManager[4054]: <info> [1610103824.6999] dhcp4 (wlp3s0): option dhcp_lease_time => '864000'
NetworkManager[4054]: <info> [1610103824.7000] dhcp4 (wlp3s0): option domain_name => 'fritz.box'
NetworkManager[4054]: <info> [1610103824.7001] dhcp4 (wlp3s0): option domain_name_servers => '192.168.178.1'
NetworkManager[4054]: <info> [1610103824.7001] dhcp4 (wlp3s0): option expiry => '1610967824'
NetworkManager[4054]: <info> [1610103824.7002] dhcp4 (wlp3s0): option ip_address => '192.168.178.79'
NetworkManager[4054]: <info> [1610103824.7002] dhcp4 (wlp3s0): option next_server => '192.168.178.1'
NetworkManager[4054]: <info> [1610103824.7002] dhcp4 (wlp3s0): option ntp_servers => '192.168.178.1'
NetworkManager[4054]: <info> [1610103824.7003] dhcp4 (wlp3s0): option requested_broadcast_address => '1'
NetworkManager[4054]: <info> [1610103824.7003] dhcp4 (wlp3s0): option requested_domain_name => '1'
NetworkManager[4054]: <info> [1610103824.7004] dhcp4 (wlp3s0): option requested_domain_name_servers => '1'
NetworkManager[4054]: <info> [1610103824.7004] dhcp4 (wlp3s0): option requested_domain_search => '1'
NetworkManager[4054]: <info> [1610103824.7004] dhcp4 (wlp3s0): option requested_host_name => '1'
NetworkManager[4054]: <info> [1610103824.7005] dhcp4 (wlp3s0): option requested_interface_mtu => '1'
NetworkManager[4054]: <info> [1610103824.7005] dhcp4 (wlp3s0): option requested_ms_classless_static_routes => '1'
avahi-daemon[1044]: Joining mDNS multicast group on interface wlp3s0.IPv4 with address 192.168.178.79.
NetworkManager[4054]: <info> [1610103824.7005] dhcp4 (wlp3s0): option requested_nis_domain => '1'
NetworkManager[4054]: <info> [1610103824.7006] dhcp4 (wlp3s0): option requested_nis_servers => '1'
NetworkManager[4054]: <info> [1610103824.7006] dhcp4 (wlp3s0): option requested_ntp_servers => '1'
NetworkManager[4054]: <info> [1610103824.7007] dhcp4 (wlp3s0): option requested_rfc3442_classless_static_routes => '1'
NetworkManager[4054]: <info> [1610103824.7007] dhcp4 (wlp3s0): option requested_root_path => '1'
NetworkManager[4054]: <info> [1610103824.7008] dhcp4 (wlp3s0): option requested_routers => '1'
NetworkManager[4054]: <info> [1610103824.7008] dhcp4 (wlp3s0): option requested_static_routes => '1'
NetworkManager[4054]: <info> [1610103824.7008] dhcp4 (wlp3s0): option requested_subnet_mask => '1'
NetworkManager[4054]: <info> [1610103824.7009] dhcp4 (wlp3s0): option requested_time_offset => '1'
NetworkManager[4054]: <info> [1610103824.7009] dhcp4 (wlp3s0): option requested_wpad => '1'
NetworkManager[4054]: <info> [1610103824.7010] dhcp4 (wlp3s0): option routers => '192.168.178.1'
NetworkManager[4054]: <info> [1610103824.7010] dhcp4 (wlp3s0): option subnet_mask => '255.255.255.0'
NetworkManager[4054]: <info> [1610103824.7010] dhcp4 (wlp3s0): state changed unknown -> bound
avahi-daemon[1044]: New relevant interface wlp3s0.IPv4 for mDNS.
avahi-daemon[1044]: Registering new address record for 192.168.178.79 on wlp3s0.IPv4.
NetworkManager[4054]: <info> [1610103824.7194] device (wlp3s0): state change: ip-config -> ip-check (reason 'none', sys-iface-state: 'managed')
NetworkManager[4054]: <info> [1610103824.7302] device (wlp3s0): state change: ip-check -> secondaries (reason 'none', sys-iface-state: 'managed')
NetworkManager[4054]: <info> [1610103824.7306] device (wlp3s0): state change: secondaries -> activated (reason 'none', sys-iface-state: 'managed')
NetworkManager[4054]: <info> [1610103824.7313] manager: NetworkManager state is now CONNECTED_LOCAL
NetworkManager[4054]: <info> [1610103824.7483] manager: NetworkManager state is now CONNECTED_SITE
NetworkManager[4054]: <info> [1610103824.7528] policy: set 'MyRouter' (wlp3s0) as default for IPv4 routing and DNS
NetworkManager[4054]: <info> [1610103824.7537] device (wlp3s0): Activation: successful, device activated.
NetworkManager[4054]: <info> [1610103824.7564] manager: startup complete
kdeconnectd.desktop[2328]: kdeconnect.core: Broadcasting identity packet
systemd[1]: Starting resolvconf-pull-resolved.service...
systemd[1]: resolvconf-pull-resolved.service: Succeeded.
systemd[1]: Finished resolvconf-pull-resolved.service.
systemd-resolved[454]: Using degraded feature set (UDP) for DNS server 192.168.178.1.
wpa_supplicant[1109]: wlp3s0: CTRL-EVENT-SIGNAL-CHANGE above=1 signal=-47 noise=9999 txrate=13500
NetworkManager[4054]: <info> [1610103825.7385] manager: NetworkManager state is now CONNECTED_GLOBAL
whoopsie[1741]: [12:03:49] The default IPv4 route is: /org/freedesktop/NetworkManager/ActiveConnection/4
whoopsie[1741]: [12:03:49] Not a paid data plan: /org/freedesktop/NetworkManager/ActiveConnection/4
whoopsie[1741]: [12:03:49] Found usable connection: /org/freedesktop/NetworkManager/ActiveConnection/4
whoopsie[1741]: [12:03:49] online
systemd[1]: NetworkManager-dispatcher.service: Succeeded.
我看不出错误行为的原因。你能吗？还有其他日志可能有助于分析问题吗？