据我所知，网上已经有很多关于此问题的信息。我尝试了人们提出的几种解决方案（其中一种导致我不得不重新安装操作系统）。
所以我有一台由 pcspecialist.co.uk 的人制造的新笔记本电脑
无论如何，lshw 显示以下内容：
mark-w54-55su1-suw
description: Computer
width: 64 bits
capabilities: vsyscall32
*-core
description: Motherboard
physical id: 0
*-memory
description: System memory
physical id: 0
size: 7901MiB
*-cpu
product: Intel(R) Core(TM) i7-4712MQ CPU @ 2.30GHz
vendor: Intel Corp.
physical id: 1
bus info: cpu@0
size: 800MHz
capacity: 800MHz
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 xsaveopt pln pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid cpufreq
*-pci
description: Host bridge
product: Xeon E3-1200 v3/4th Gen Core Processor DRAM Controller
vendor: Intel Corporation
physical id: 100
bus info: pci@0000:00:00.0
version: 06
width: 32 bits
clock: 33MHz
*-display
description: VGA compatible controller
product: 4th Gen Core Processor Integrated Graphics Controller
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 06
width: 64 bits
clock: 33MHz
capabilities: vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:44 memory:f7800000-f7bfffff memory:e0000000-efffffff ioport:f000(size=64)
*-multimedia:0
description: Audio device
product: Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller
vendor: Intel Corporation
physical id: 3
bus info: pci@0000:00:03.0
version: 06
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list
configuration: driver=snd_hda_intel latency=0
resources: irq:47 memory:f7e14000-f7e17fff
*-usb:0
description: USB controller
product: 8 Series/C220 Series Chipset Family USB xHCI
vendor: Intel Corporation
physical id: 14
bus info: pci@0000:00:14.0
version: 05
width: 64 bits
clock: 33MHz
capabilities: xhci bus_master cap_list
configuration: driver=xhci_hcd latency=0
resources: irq:40 memory:f7e00000-f7e0ffff
*-communication
description: Communication controller
product: 8 Series/C220 Series Chipset Family MEI Controller #1
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:45 memory:f7e1e000-f7e1e00f
*-usb:1
description: USB controller
product: 8 Series/C220 Series Chipset Family USB EHCI #2
vendor: Intel Corporation
physical id: 1a
bus info: pci@0000:00:1a.0
version: 05
width: 32 bits
clock: 33MHz
capabilities: ehci bus_master cap_list
configuration: driver=ehci-pci latency=0
resources: irq:16 memory:f7e1c000-f7e1c3ff
*-multimedia:1
description: Audio device
product: 8 Series/C220 Series Chipset High Definition Audio Controller
vendor: Intel Corporation
physical id: 1b
bus info: pci@0000:00:1b.0
version: 05
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list
configuration: driver=snd_hda_intel latency=0
resources: irq:46 memory:f7e10000-f7e13fff
*-pci:0
description: PCI bridge
product: 8 Series/C220 Series Chipset Family PCI Express Root Port #1
vendor: Intel Corporation
physical id: 1c
bus info: pci@0000:00:1c.0
version: d5
width: 32 bits
clock: 33MHz
capabilities: pci normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:16 ioport:2000(size=4096) memory:df200000-df3fffff ioport:df400000(size=2097152)
*-pci:1
description: PCI bridge
product: 8 Series/C220 Series Chipset Family PCI Express Root Port #3
vendor: Intel Corporation
physical id: 1c.2
bus info: pci@0000:00:1c.2
version: d5
width: 32 bits
clock: 33MHz
capabilities: pci normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:18 ioport:e000(size=4096) memory:f7d00000-f7dfffff
*-network
description: Wireless interface
product: RTL8723BE PCIe Wireless Network Adapter
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:02:00.0
logical name: wlan0
version: 00
serial: 30:10:b3:b3:1f:ec
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=rtl8723be driverversion=3.13.0-46-generic firmware=N/A ip=192.168.0.6 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
resources: irq:18 ioport:e000(size=256) memory:f7d00000-f7d03fff
*-pci:2
description: PCI bridge
product: 8 Series/C220 Series Chipset Family PCI Express Root Port #4
vendor: Intel Corporation
physical id: 1c.3
bus info: pci@0000:00:1c.3
version: d5
width: 32 bits
clock: 33MHz
capabilities: pci normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:19 ioport:d000(size=4096) memory:f7c00000-f7cfffff
*-generic
description: Unassigned class
product: Realtek Semiconductor Co., Ltd.
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:03:00.0
version: 01
width: 32 bits
clock: 33MHz
capabilities: bus_master cap_list rom
configuration: driver=rtsx_pci latency=0
resources: irq:42 memory:f7c15000-f7c15fff memory:f7c00000-f7c0ffff
*-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@0000:03:00.1
logical name: eth0
version: 12
serial: 80:fa:5b:0c:3f:ac
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:41 ioport:d000(size=256) memory:f7c14000-f7c14fff memory:f7c10000-f7c13fff
*-usb:2
description: USB controller
product: 8 Series/C220 Series Chipset Family USB EHCI #1
vendor: Intel Corporation
physical id: 1d
bus info: pci@0000:00:1d.0
version: 05
width: 32 bits
clock: 33MHz
capabilities: ehci bus_master cap_list
configuration: driver=ehci-pci latency=0
resources: irq:23 memory:f7e1b000-f7e1b3ff
*-isa
description: ISA bridge
product: HM86 Express LPC Controller
vendor: Intel Corporation
physical id: 1f
bus info: pci@0000:00:1f.0
version: 05
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: 8 Series/C220 Series Chipset Family 6-port SATA Controller 1 [AHCI mode]
vendor: Intel Corporation
physical id: 1f.2
bus info: pci@0000:00:1f.2
version: 05
width: 32 bits
clock: 66MHz
capabilities: storage ahci_1.0 bus_master cap_list
configuration: driver=ahci latency=0
resources: irq:43 ioport:f0b0(size=8) ioport:f0a0(size=4) ioport:f090(size=8) ioport:f080(size=4) ioport:f060(size=32) memory:f7e1a000-f7e1a7ff
*-serial UNCLAIMED
description: SMBus
product: 8 Series/C220 Series Chipset Family SMBus Controller
vendor: Intel Corporation
physical id: 1f.3
bus info: pci@0000:00:1f.3
version: 05
width: 64 bits
clock: 33MHz
configuration: latency=0
resources: memory:f7e19000-f7e190ff ioport:f040(size=32)
*-scsi
physical id: 2
logical name: scsi0
capabilities: emulated
*-cdrom
description: DVD-RAM writer
product: CDDVDW SU-208FB
vendor: TSSTcorp
physical id: 0.0.0
bus info: scsi@0:0.0.0
logical name: /dev/cdrom
logical name: /dev/sr0
version: TC00
capabilities: removable audio cd-r cd-rw dvd dvd-r dvd-ram
configuration: ansiversion=5 status=nodisc
iwconfig 显示以下内容：
mark@mark-W54-55SU1-SUW:~$ iwconfig
eth0 no wireless extensions.
lo no wireless extensions.
wlan0 IEEE 802.11bgn ESSID:"NETGEARPUR"
Mode:Managed Frequency:2.462 GHz Access Point: 00:1E:2A:1F:80:14
Bit Rate=1 Mb/s Tx-Power=20 dBm
Retry long limit:7 RTS thr=2347 B Fragment thr:off
Power Management:off
Link Quality=56/70 Signal level=-54 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:17 Missed beacon:0
我甚至认为内核升级可能会有帮助，但它似乎根本没有帮助：
uname -a
Linux mark-W54-55SU1-SUW 3.13.0-46-generic #79-Ubuntu SMP Tue Mar 10 20:06:50 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
我似乎唯一的临时解决方案是运行：
sudo service network-manager restart
但目前看来，即使这样也不起作用。我不得不重启网络管理器才能写这篇文章！
欢迎提出任何想法。我确实想知道降级操作系统是否更好。
提前致谢，
标记。