我使用双启动的 ubuntu 和 windows 10。当我启动 ubuntu 时，以太网显示已连接但无法访问互联网。但如果在此期间我不碰我的电脑，15-30 分钟后我就可以访问互联网。为什么会出现这个问题？
系统日志
Jul 17 10:56:40 ninja-desktop ModemManager[4043]: <warn> Couldn't find support for device at '/sys/devices/pci0000:00/0000:00:1c.2/0000:02:00.0': not supported by any plugin
Jul 17 10:56:40 ninja-desktop NetworkManager[4050]: <info> (eth0): carrier now ON (device state 20)
Jul 17 10:56:40 ninja-desktop NetworkManager[4050]: <info> (eth0): device state change: unavailable -> disconnected (reason 'carrier-changed') [20 30 40]
Jul 17 10:56:40 ninja-desktop kernel: [ 3384.440789] r8169 0000:02:00.0 eth0: link up
Jul 17 10:56:40 ninja-desktop kernel: [ 3384.440803] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
Jul 17 10:56:40 ninja-desktop NetworkManager[4050]: <info> Auto-activating connection 'Connect'.
Jul 17 10:56:40 ninja-desktop NetworkManager[4050]: <info> Activation (eth0) starting connection 'Connect'
Jul 17 10:56:40 ninja-desktop NetworkManager[4050]: <info> (eth0): device state change: disconnected -> prepare (reason 'none') [30 40 0]
Jul 17 10:56:40 ninja-desktop NetworkManager[4050]: <info> NetworkManager state is now CONNECTING
Jul 17 10:56:40 ninja-desktop NetworkManager[4050]: <info> Activation (eth0) Stage 1 of 5 (Device Prepare) scheduled...
Jul 17 10:56:40 ninja-desktop NetworkManager[4050]: <info> Activation (eth0) Stage 1 of 5 (Device Prepare) started...
Jul 17 10:56:40 ninja-desktop NetworkManager[4050]: <info> Activation (eth0) Stage 2 of 5 (Device Configure) scheduled...
Jul 17 10:56:40 ninja-desktop NetworkManager[4050]: <info> Activation (eth0) Stage 1 of 5 (Device Prepare) complete.
Jul 17 10:56:40 ninja-desktop NetworkManager[4050]: <info> Activation (eth0) Stage 2 of 5 (Device Configure) starting...
Jul 17 10:56:40 ninja-desktop NetworkManager[4050]: <info> (eth0): device state change: prepare -> config (reason 'none') [40 50 0]
Jul 17 10:56:40 ninja-desktop NetworkManager[4050]: <info> Activation (eth0) Stage 2 of 5 (Device Configure) successful.
Jul 17 10:56:40 ninja-desktop NetworkManager[4050]: <info> Activation (eth0) Stage 3 of 5 (IP Configure Start) scheduled.
Jul 17 10:56:40 ninja-desktop NetworkManager[4050]: <info> Activation (eth0) Stage 2 of 5 (Device Configure) complete.
Jul 17 10:56:40 ninja-desktop NetworkManager[4050]: <info> Activation (eth0) Stage 3 of 5 (IP Configure Start) started...
Jul 17 10:56:40 ninja-desktop NetworkManager[4050]: <info> (eth0): device state change: config -> ip-config (reason 'none') [50 70 0]
Jul 17 10:56:40 ninja-desktop NetworkManager[4050]: <info> Activation (eth0) Stage 5 of 5 (IPv4 Configure Commit) scheduled...
Jul 17 10:56:40 ninja-desktop NetworkManager[4050]: <info> Activation (eth0) Stage 3 of 5 (IP Configure Start) complete.
Jul 17 10:56:40 ninja-desktop NetworkManager[4050]: <info> Activation (eth0) Stage 5 of 5 (IPv4 Commit) started...
Jul 17 10:56:40 ninja-desktop avahi-daemon[593]: Joining mDNS multicast group on interface eth0.IPv4 with address 10.0.0.4.
Jul 17 10:56:40 ninja-desktop avahi-daemon[593]: New relevant interface eth0.IPv4 for mDNS.
Jul 17 10:56:40 ninja-desktop avahi-daemon[593]: Registering new address record for 10.0.0.4 on eth0.IPv4.
Jul 17 10:56:41 ninja-desktop NetworkManager[4050]: <info> (eth0): device state change: ip-config -> secondaries (reason 'none') [70 90 0]
Jul 17 10:56:41 ninja-desktop NetworkManager[4050]: <info> Activation (eth0) Stage 5 of 5 (IPv4 Commit) complete.
Jul 17 10:56:41 ninja-desktop NetworkManager[4050]: <info> (eth0): device state change: secondaries -> activated (reason 'none') [90 100 0]
Jul 17 10:56:41 ninja-desktop NetworkManager[4050]: <info> NetworkManager state is now CONNECTED_GLOBAL
Jul 17 10:56:41 ninja-desktop NetworkManager[4050]: <info> Policy set 'Connect' (eth0) as default for IPv4 routing and DNS.
Jul 17 10:56:41 ninja-desktop NetworkManager[4050]: nm_dns_plugin_child_spawn: assertion 'argv[0] != NULL' failed
Jul 17 10:56:41 ninja-desktop NetworkManager[4050]: <warn> DNS: plugin dnsmasq update failed
Jul 17 10:56:41 ninja-desktop NetworkManager[4050]: <info> Writing DNS information to /sbin/resolvconf
Jul 17 10:56:41 ninja-desktop avahi-daemon[593]: Joining mDNS multicast group on interface eth0.IPv6 with address fe80::eea8:6bff:fe70:9564.
Jul 17 10:56:41 ninja-desktop avahi-daemon[593]: New relevant interface eth0.IPv6 for mDNS.
Jul 17 10:56:41 ninja-desktop avahi-daemon[593]: Registering new address record for fe80::eea8:6bff:fe70:9564 on eth0.*.
Jul 17 10:56:53 ninja-desktop NetworkManager[4050]: <info> Activation (eth0) successful, device activated.
Jul 17 10:56:53 ninja-desktop dbus[453]: [system] Activating service name='org.freedesktop.nm_dispatcher' (using servicehelper)
Jul 17 10:56:53 ninja-desktop NetworkManager[4050]: <info> WiFi hardware radio set enabled
Jul 17 10:56:53 ninja-desktop dbus[453]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Jul 17 10:57:33 ninja-desktop ntpdate[4136]: Can't find host ntp.ubuntu.com: Name or service not known (-2)
Jul 17 10:57:33 ninja-desktop ntpdate[4136]: no servers can be used, exiting
Jul 17 11:00:10 ninja-desktop kernel: [ 3594.937552] usb 1-1.3: new high-speed USB device number 5 using ehci-pci
Jul 17 11:00:10 ninja-desktop kernel: [ 3595.032704] usb 1-1.3: New USB device found, idVendor=1307, idProduct=0163
Jul 17 11:00:10 ninja-desktop kernel: [ 3595.032710] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Jul 17 11:00:10 ninja-desktop kernel: [ 3595.032712] usb 1-1.3: Product: USB Flash Drive
Jul 17 11:00:10 ninja-desktop kernel: [ 3595.032714] usb 1-1.3: Manufacturer: USB 2.0
Jul 17 11:00:10 ninja-desktop kernel: [ 3595.032716] usb 1-1.3: SerialNumber: 97d4e5f6b2639d
Jul 17 11:00:10 ninja-desktop mtp-probe: checking bus 1, device 5: "/sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3"
Jul 17 11:00:10 ninja-desktop mtp-probe: bus: 1, device: 5 was not an MTP device
Jul 17 11:00:10 ninja-desktop kernel: [ 3595.046300] usb-storage 1-1.3:1.0: USB Mass Storage device detected
Jul 17 11:00:10 ninja-desktop kernel: [ 3595.046463] scsi host4: usb-storage 1-1.3:1.0
Jul 17 11:00:10 ninja-desktop kernel: [ 3595.046582] usbcore: registered new interface driver usb-storage
Jul 17 11:00:10 ninja-desktop kernel: [ 3595.049512] usbcore: registered new interface driver uas
Jul 17 11:00:11 ninja-desktop kernel: [ 3596.046862] scsi 4:0:0:0: Direct-Access USB 2.0 USB Flash Drive 0.00 PQ: 0 ANSI: 2
Jul 17 11:00:11 ninja-desktop kernel: [ 3596.047245] sd 4:0:0:0: Attached scsi generic sg2 type 0
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答案1
在你的日志中我看到 ipv6 也配置了
Jul 17 10:56:41 ninja-desktop avahi-daemon[593]: Joining mDNS multicast group on interface eth0.IPv6 with address fe80::eea8:6bff:fe70:9564.
Jul 17 10:56:41 ninja-desktop avahi-daemon[593]: New relevant interface eth0.IPv6 for mDNS.
Jul 17 10:56:41 ninja-desktop avahi-daemon[593]: Registering new address record for fe80::eea8:6bff:fe70:9564 on eth0.*.
您能否将网卡上的 ipv6 设置修改为方法：忽略，看看它是否有效？
还要检查的另一件事是 dnsmasq。您可以检查 dnsmasq 是否已安装并将其删除。
使用以下命令
sudo apt-get remove dnsmasq
我发现这个解决方案ubuntu论坛。
答案2
您需要检查您网络的DNS设置，进入网络-->设置-->IPV4设置-->其他DNS设置，添加您服务提供商提供的DNS地址，重启浏览器检查。