我正在运行 Ubuntu 14.04，但只能使用互联网一段时间。浏览几分钟后，路由器仍然连接着，但我没有互联网连接。我不知道如何解决这个问题。请记住，我是 Ubuntu 新手。
系统信息：
PCI (sysfs)
mmk-aspire-v7-582pg
description: Computer
width: 64 bits
capabilities: vsyscall32
*-core
description: Motherboard
physical id: 0
*-memory
description: System memory
physical id: 0
size: 7864MiB
*-cpu
product: Intel(R) Core(TM) i7-4500U CPU @ 1.80GHz
vendor: Intel Corp.
physical id: 1
bus info: cpu@0
size: 1800MHz
capacity: 1800MHz
width: 64 bits
capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp x86-64 constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 fma cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm ida arat epb pln pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid xsaveopt cpufreq
*-pci
description: Host bridge
product: Haswell-ULT DRAM Controller
vendor: Intel Corporation
physical id: 100
bus info: pci@0000:00:00.0
version: 09
width: 32 bits
clock: 33MHz
*-display
description: VGA compatible controller
product: Haswell-ULT Integrated Graphics Controller
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 09
width: 64 bits
clock: 33MHz
capabilities: vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:51 memory:b3000000-b33fffff memory:c0000000-cfffffff ioport:5000(size=64)
*-multimedia:0
description: Audio device
product: Haswell-ULT HD Audio Controller
vendor: Intel Corporation
physical id: 3
bus info: pci@0000:00:03.0
version: 09
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list
configuration: driver=snd_hda_intel latency=0
resources: irq:52 memory:b3610000-b3613fff
*-usb:0
description: USB controller
product: Lynx Point-LP USB xHCI HC
vendor: Intel Corporation
physical id: 14
bus info: pci@0000:00:14.0
version: 04
width: 64 bits
clock: 33MHz
capabilities: xhci bus_master cap_list
configuration: driver=xhci_hcd latency=0
resources: irq:44 memory:b3600000-b360ffff
*-communication
description: Communication controller
product: Lynx Point-LP HECI #0
vendor: Intel Corporation
physical id: 16
bus info: pci@0000:00:16.0
version: 04
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list
configuration: driver=mei_me latency=0
resources: irq:48 memory:b3618000-b361801f
*-multimedia:1
description: Audio device
product: Lynx Point-LP HD Audio Controller
vendor: Intel Corporation
physical id: 1b
bus info: pci@0000:00:1b.0
version: 04
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list
configuration: driver=snd_hda_intel latency=0
resources: irq:49 memory:b3614000-b3617fff
*-pci:0
description: PCI bridge
product: Lynx Point-LP PCI Express Root Port 1
vendor: Intel Corporation
physical id: 1c
bus info: pci@0000:00:1c.0
version: e4
width: 32 bits
clock: 33MHz
capabilities: pci normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:40 ioport:2000(size=4096) memory:9fb00000-9fcfffff ioport:9fd00000(size=2097152)
*-pci:1
description: PCI bridge
product: Lynx Point-LP PCI Express Root Port 3
vendor: Intel Corporation
physical id: 1c.2
bus info: pci@0000:00:1c.2
version: e4
width: 32 bits
clock: 33MHz
capabilities: pci normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:41 memory:b3500000-b35fffff
*-network
description: Wireless interface
product: Wireless 7260
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:04:00.0
logical name: wlan0
version: 73
serial: ac:7b:a1:65:0c:11
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=3.19.0-80-generic firmware=25.17.12.0 ip=192.168.1.100 latency=0 link=yes multicast=yes wireless=IEEE 802.11abgn
resources: irq:50 memory:b3500000-b3501fff
*-pci:2
description: PCI bridge
product: Lynx Point-LP PCI Express Root Port 4
vendor: Intel Corporation
physical id: 1c.3
bus info: pci@0000:00:1c.3
version: e4
width: 32 bits
clock: 33MHz
capabilities: pci normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:42 ioport:4000(size=4096) memory:b3400000-b34fffff
*-generic
description: Unassigned class
product: Realtek Semiconductor Co., Ltd.
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:05:00.0
version: 01
width: 32 bits
clock: 33MHz
capabilities: bus_master cap_list rom
configuration: driver=rtsx_pci latency=0
resources: irq:45 memory:b3405000-b3405fff memory:b3410000-b341ffff
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0.1
bus info: pci@0000:05:00.1
logical name: eth0
version: 14
serial: c4:54:44:2b:66:4f
size: 10Mbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8411-2_0.0.1 07/08/13 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
resources: irq:47 ioport:4000(size=256) memory:b3404000-b3404fff memory:b3400000-b3403fff
*-pci:3
description: PCI bridge
product: Lynx Point-LP PCI Express Root Port 5
vendor: Intel Corporation
physical id: 1c.4
bus info: pci@0000:00:1c.4
version: e4
width: 32 bits
clock: 33MHz
capabilities: pci normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:43 ioport:3000(size=4096) memory:b2000000-b2ffffff ioport:a0000000(size=301989888)
*-display
description: 3D controller
product: GK107M [GeForce GT 750M]
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@0000:01:00.0
version: a1
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list
configuration: driver=nouveau latency=0
resources: irq:53 memory:b2000000-b2ffffff memory:a0000000-afffffff memory:b0000000-b1ffffff ioport:3000(size=128)
*-usb:1
description: USB controller
product: Lynx Point-LP USB EHCI #1
vendor: Intel Corporation
physical id: 1d
bus info: pci@0000:00:1d.0
version: 04
width: 32 bits
clock: 33MHz
capabilities: ehci bus_master cap_list
configuration: driver=ehci-pci latency=0
resources: irq:23 memory:b361c000-b361c3ff
*-isa
description: ISA bridge
product: Lynx Point-LP LPC Controller
vendor: Intel Corporation
physical id: 1f
bus info: pci@0000:00:1f.0
version: 04
width: 32 bits
clock: 33MHz
capabilities: isa bus_master cap_list
configuration: driver=lpc_ich latency=0
resources: irq:0
*-storage
description: SATA controller
product: Lynx Point-LP SATA Controller 1 [AHCI mode]
vendor: Intel Corporation
physical id: 1f.2
bus info: pci@0000:00:1f.2
version: 04
width: 32 bits
clock: 66MHz
capabilities: storage ahci_1.0 bus_master cap_list
configuration: driver=ahci latency=0
resources: irq:46 ioport:5088(size=8) ioport:5094(size=4) ioport:5080(size=8) ioport:5090(size=4) ioport:5060(size=32) memory:b361b000-b361b7ff
*-serial UNCLAIMED
description: SMBus
product: Lynx Point-LP SMBus Controller
vendor: Intel Corporation
physical id: 1f.3
bus info: pci@0000:00:1f.3
version: 04
width: 64 bits
clock: 33MHz
configuration: latency=0
resources: memory:b3619000-b36190ff ioport:5040(size=32)