所以我的 wifi 可以工作一小会儿（比如说 5-10 分钟）没有问题。之后它就停止了。
观察结果：
- 当我在 Wi-Fi 停止工作后单击它时，我仍然连接到网络（只是没有连接到互联网）
- 当我查看周围的网络列表时，我只能看到我所连接的网络。
- 这件事在我升级到 Bionic Beaver 时开始发生。
- 如果我再次打开并关闭 wifi，它将完全不可用（即计算机似乎认为 wifi 硬件不存在）
lshw内容 ：
8-bit
description: Notebook
product: Inspiron 5559 (06B2)
vendor: Dell Inc.
serial: 2YJXDC2
width: 64 bits
capabilities: smbios-2.8 dmi-2.8 smp vsyscall32
configuration: boot=normal chassis=docking family=Inspiron sku=06B2 uuid=44454C4C-5900-104A-8058-B2C04F444332
*-core
description: Motherboard
product: 052K07
vendor: Dell Inc.
physical id: 0
version: A00
serial: /2YJXDC2/CN1296365N0022/
*-firmware
description: BIOS
vendor: Dell Inc.
physical id: 0
version: 1.2.8
date: 02/08/2017
size: 64KiB
capacity: 15MiB
capabilities: pci pnp upgrade shadowing cdboot bootselect edd int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard int14serial int17printer acpi usb smartbattery biosbootspecification netboot uefi
*-cache:0
description: L1 cache
physical id: 41
slot: L1 Cache
size: 64KiB
capacity: 64KiB
capabilities: synchronous internal write-back data
configuration: level=1
*-cache:1
description: L1 cache
physical id: 42
slot: L1 Cache
size: 64KiB
capacity: 64KiB
capabilities: synchronous internal write-back instruction
configuration: level=1
*-cache:2
description: L2 cache
physical id: 43
slot: L2 Cache
size: 512KiB
capacity: 512KiB
capabilities: synchronous internal write-back unified
configuration: level=2
*-cache:3
description: L3 cache
physical id: 44
slot: L3 Cache
size: 4MiB
capacity: 4MiB
capabilities: synchronous internal write-back unified
configuration: level=3
*-cpu
description: CPU
product: Intel(R) Core(TM) i7-6500U CPU @ 2.50GHz
vendor: Intel Corp.
physical id: 45
bus info: cpu@0
version: Intel(R) Core(TM) i7-6500U CPU @ 2.50GHz
serial: To Be Filled By O.E.M.
slot: U3E1
size: 498MHz
capacity: 3100MHz
width: 64 bits
clock: 100MHz
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 art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb invpcid_single pti tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid mpx rdseed adx smap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsaves ibpb ibrs stibp dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp cpufreq
configuration: cores=2 threads=4
*-memory
description: System Memory
physical id: 46
slot: System board or motherboard
size: 16GiB
*-bank:0
description: SODIMM DDR3 Synchronous 1600 MHz (0.6 ns)
product: KHX1600C9S3L/8G
vendor: Kingston
physical id: 0
serial: 12151215
slot: DIMM A
size: 8GiB
width: 64 bits
clock: 1600MHz (0.6ns)
*-bank:1
description: SODIMM DDR3 Synchronous 1600 MHz (0.6 ns)
product: KHX1600C9S3L/8G
vendor: Kingston
physical id: 1
serial: 12121212
slot: DIMM B
size: 8GiB
width: 64 bits
clock: 1600MHz (0.6ns)
*-pci
description: Host bridge
product: Skylake Host Bridge/DRAM Registers
vendor: Intel Corporation
physical id: 100
bus info: pci@0000:00:00.0
version: 08
width: 32 bits
clock: 33MHz
configuration: driver=skl_uncore
resources: irq:0
*-display
description: VGA compatible controller
product: HD Graphics 520
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 07
width: 64 bits
clock: 33MHz
capabilities: pciexpress msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:125 memory:d1000000-d1ffffff memory:b0000000-bfffffff ioport:f000(size=64) memory:c0000-dffff
*-usb
description: USB controller
product: Sunrise Point-LP USB 3.0 xHCI Controller
vendor: Intel Corporation
physical id: 14
bus info: pci@0000:00:14.0
version: 21
width: 64 bits
clock: 33MHz
capabilities: pm msi xhci bus_master cap_list
configuration: driver=xhci_hcd latency=0
resources: irq:122 memory:d2210000-d221ffff
*-usbhost:0
product: xHCI Host Controller
vendor: Linux 4.15.0-20-generic xhci-hcd
physical id: 0
bus info: usb@1
logical name: usb1
version: 4.15
capabilities: usb-2.00
configuration: driver=hub slots=12 speed=480Mbit/s
*-usb:0
description: Generic USB device
product: USB2.0-CRW
vendor: Generic
physical id: 6
bus info: usb@1:6
version: 39.60
serial: 20100201396000000
capabilities: usb-2.00
configuration: driver=rtsx_usb maxpower=500mA speed=480Mbit/s
*-usb:1 UNCLAIMED
description: Human interface device
product: LGD AIT Touch Controller
vendor: Melfas
physical id: 7
bus info: usb@1:7
version: 5.00
capabilities: usb-1.10
configuration: maxpower=100mA speed=12Mbit/s
*-usb:2
description: Bluetooth wireless interface
vendor: Intel Corp.
physical id: 8
bus info: usb@1:8
version: 0.01
capabilities: bluetooth usb-2.00
configuration: driver=btusb maxpower=100mA speed=12Mbit/s
*-usbhost:1
product: xHCI Host Controller
vendor: Linux 4.15.0-20-generic xhci-hcd
physical id: 1
bus info: usb@2
logical name: usb2
version: 4.15
capabilities: usb-3.00
configuration: driver=hub slots=6 speed=5000Mbit/s
*-usb
description: Video
product: Intel(R) RealSense(TM) 3D Camera (Front F200)
vendor: Intel(R) RealSense(TM) 3D Camera (Front F200)
physical id: 3
bus info: usb@2:3
version: 27.80
serial: 032150074902
capabilities: usb-3.00
configuration: driver=uvcvideo maxpower=440mA speed=5000Mbit/s
*-generic:0
description: Signal processing controller
product: Sunrise Point-LP Thermal subsystem
vendor: Intel Corporation
physical id: 14.2
bus info: pci@0000:00:14.2
version: 21
width: 64 bits
clock: 33MHz
capabilities: pm msi cap_list
configuration: driver=intel_pch_thermal latency=0
resources: irq:18 memory:d2230000-d2230fff
*-generic:1
description: Signal processing controller
product: Sunrise Point-LP Serial IO I2C Controller #0
vendor: Intel Corporation
physical id: 15
bus info: pci@0000:00:15.0
version: 21
width: 64 bits
clock: 33MHz
capabilities: pm bus_master cap_list
configuration: driver=intel-lpss latency=0
resources: irq:16 memory:d222f000-d222ffff
*-generic:2
description: Signal processing controller
product: Sunrise Point-LP Serial IO I2C Controller #1
vendor: Intel Corporation
physical id: 15.1
bus info: pci@0000:00:15.1
version: 21
width: 64 bits
clock: 33MHz
capabilities: pm bus_master cap_list
configuration: driver=intel-lpss latency=0
resources: irq:17 memory:d222e000-d222efff
*-communication
description: Communication controller
product: Sunrise Point-LP CSME HECI #1
vendor: Intel Corporation
physical id: 16
bus info: pci@0000:00:16.0
version: 21
width: 64 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list
configuration: driver=mei_me latency=0
resources: irq:127 memory:d222d000-d222dfff
*-storage
description: SATA controller
product: Sunrise Point-LP SATA Controller [AHCI mode]
vendor: Intel Corporation
physical id: 17
bus info: pci@0000:00:17.0
version: 21
width: 32 bits
clock: 66MHz
capabilities: storage msi pm ahci_1.0 bus_master cap_list
configuration: driver=ahci latency=0
resources: irq:123 memory:d2228000-d2229fff memory:d222c000-d222c0ff ioport:f090(size=8) ioport:f080(size=4) ioport:f060(size=32) memory:d222b000-d222b7ff
*-pci:0
description: PCI bridge
product: Intel Corporation
vendor: Intel Corporation
physical id: 1c
bus info: pci@0000:00:1c.0
version: f1
width: 32 bits
clock: 33MHz
capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:16 ioport:e000(size=4096) memory:c0000000-d00fffff
*-display
description: Display controller
product: Sun XT [Radeon HD 8670A/8670M/8690M / R5 M330 / M430]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 0
bus info: pci@0000:01:00.0
version: 81
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi bus_master cap_list rom
configuration: driver=radeon latency=0
resources: irq:126 memory:c0000000-cfffffff memory:d0000000-d003ffff ioport:e000(size=256) memory:d0040000-d005ffff
*-pci:1
description: PCI bridge
product: Sunrise Point-LP PCI Express Root Port #5
vendor: Intel Corporation
physical id: 1c.4
bus info: pci@0000:00:1c.4
version: f1
width: 32 bits
clock: 33MHz
capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:16 memory:d2100000-d21fffff
*-network
description: Wireless interface
product: Wireless 3160
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:02:00.0
logical name: wlp2s0
version: 83
serial: 2c:6e:85:ef:ff:97
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=4.15.0-20-generic firmware=17.608620.0 ip=192.168.0.21 latency=0 link=yes multicast=yes wireless=IEEE 802.11
resources: irq:128 memory:d2100000-d2101fff
*-pci:2
description: PCI bridge
product: Sunrise Point-LP PCI Express Root Port #6
vendor: Intel Corporation
physical id: 1c.5
bus info: pci@0000:00:1c.5
version: f1
width: 32 bits
clock: 33MHz
capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:17 ioport:d000(size=4096) memory:d2000000-d20fffff
*-network
description: Ethernet interface
product: RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:03:00.0
logical name: enp3s0
version: 07
serial: 84:7b:eb:45:9f:1d
size: 10Mbit/s
capacity: 100Mbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8106e-1_0.0.1 06/29/12 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
resources: irq:124 ioport:d000(size=256) memory:d2004000-d2004fff memory:d2000000-d2003fff
*-isa
description: ISA bridge
product: Sunrise Point-LP LPC Controller
vendor: Intel Corporation
physical id: 1f
bus info: pci@0000:00:1f.0
version: 21
width: 32 bits
clock: 33MHz
capabilities: isa bus_master
configuration: latency=0
*-memory UNCLAIMED
description: Memory controller
product: Sunrise Point-LP PMC
vendor: Intel Corporation
physical id: 1f.2
bus info: pci@0000:00:1f.2
version: 21
width: 32 bits
clock: 33MHz (30.3ns)
configuration: latency=0
resources: memory:d2224000-d2227fff
*-multimedia
description: Audio device
product: Sunrise Point-LP HD Audio
vendor: Intel Corporation
physical id: 1f.3
bus info: pci@0000:00:1f.3
version: 21
width: 64 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list
configuration: driver=snd_hda_intel latency=32
resources: irq:129 memory:d2220000-d2223fff memory:d2200000-d220ffff
*-serial UNCLAIMED
description: SMBus
product: Sunrise Point-LP SMBus
vendor: Intel Corporation
physical id: 1f.4
bus info: pci@0000:00:1f.4
version: 21
width: 64 bits
clock: 33MHz
configuration: latency=0
resources: memory:d222a000-d222a0ff ioport:f040(size=32)
*-scsi:0
physical id: 1
logical name: scsi0
capabilities: emulated
*-disk
description: ATA Disk
product: Samsung SSD 850
physical id: 0.0.0
bus info: scsi@0:0.0.0
logical name: /dev/sda
version: 3B6Q
serial: S3PTNF0JC24293F
size: 465GiB (500GB)
capabilities: gpt-1.00 partitioned partitioned:gpt
configuration: ansiversion=5 guid=d945d3a7-3e90-4378-a83c-7b21f7aee6c2 logicalsectorsize=512 sectorsize=512
*-volume:0 UNCLAIMED
description: Windows FAT volume
vendor: mkfs.fat
physical id: 1
bus info: scsi@0:0.0.0,1
version: FAT32
serial: 673e-facf
size: 510MiB
capacity: 511MiB
capabilities: boot fat initialized
configuration: FATs=2 filesystem=fat name=EFI System Partition
*-volume:1
description: EXT4 volume
vendor: Linux
physical id: 2
bus info: scsi@0:0.0.0,2
logical name: /dev/sda2
logical name: /
version: 1.0
serial: 1ea817d6-3df0-4153-b7ea-5ef27eee2d15
size: 465GiB
capabilities: journaled extended_attributes large_files huge_files dir_nlink recover 64bit extents ext4 ext2 initialized
configuration: created=2018-02-24 18:34:12 filesystem=ext4 lastmountpoint=/ modified=2018-05-12 12:45:14 mount.fstype=ext4 mount.options=rw,relatime,errors=remount-ro,data=ordered mounted=2018-05-12 12:45:15 state=mounted
*-scsi:1
physical id: 2
logical name: scsi1
capabilities: emulated
*-cdrom
description: DVD-RAM writer
product: DVD+-RW SU-208GB
vendor: TSSTcorp
physical id: 0.0.0
bus info: scsi@1:0.0.0
logical name: /dev/cdrom
logical name: /dev/cdrw
logical name: /dev/dvd
logical name: /dev/dvdrw
logical name: /dev/sr0
version: H100
capabilities: removable audio cd-r cd-rw dvd dvd-r dvd-ram
configuration: ansiversion=5 status=nodisc
*-battery
product: DELL 991XP65
vendor: LG
physical id: 1
version: 04/28/2016
serial: 93C6
slot: Sys. Battery Bay
capacity: 41440mWh
configuration: voltage=14.8V
这是命令的输出lspci（当互联网正常工作时 - 当它再次发生时我会第二次运行它）
$ lspci -knn | grep Net -A3
02:00.0 Network controller [0280]: Intel Corporation Wireless 3160 [8086:08b3] (rev 83)
Subsystem: Intel Corporation Dual Band Wireless AC 3160 [8086:8470]
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi
^^ 这是正在工作的状态。
这些是我现在获得的确切日志（重新安装了 ubuntu）
May 17 17:59:13 8-bits kernel: [ 359.017391] iwlwifi 0000:02:00.0: Failed to wake NIC for hcmdsystem
May 17 17:59:13 8-bits kernel: [ 359.017478] iwlwifi 0000:02:00.0: Error sending SCAN_OFFLOAD_REQUEST_CMD: enqueue_hcmd failed: -5
May 17 17:59:13 8-bits kernel: [ 359.017490] iwlwifi 0000:02:00.0: Scan failed! ret -5
May 17 17:59:14 8-bits kernel: [ 360.037034] iwlwifi 0000:02:00.0: Failed to wake NIC for hcmd
May 17 17:59:14 8-bits kernel: [ 360.037063] iwlwifi 0000:02:00.0: Error sending SCAN_OFFLOAD_REQUEST_CMD: enqueue_hcmd failed: -5
May 17 17:59:14 8-bits kernel: [ 360.037066] iwlwifi 0000:02:00.0: Scan failed! ret -5
May 17 17:59:14 8-bits kernel: [ 360.660055] usb usb1-port7: Cannot enable. Maybe the USB cable is bad?
答案1
关闭或启用省电功能，如下图所示：
$ cat /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf
[connection]
wifi.powersave = 3
# Slow sleep fix: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1670041
#wifi.powersave = 2
- 编辑上面显示的网络管理器文件。
WiFi.powersave从更改2为3。- 如果已经设置为，
3请尝试将其设置为2。 - 保存文件后运行
sudo systemctl restart NetworkManager
这些值代表什么？
- NM_SETTING_WIRELESS_POWERSAVE_DISABLE (2)：禁用省电模式
- NM_SETTING_WIRELESS_POWERSAVE_ENABLE (3): 启用省电功能
英特尔具体答案
由此回答你可以试试：
您可以通过在终端中运行来修复它
sudo tee /etc/modprobe.d/iwlwifi-opt.conf <<< "options iwlwifi 11n_disable=1"
然后重新启动。
您可以通过 恢复它sudo rm /etc/modprobe.d/iwlwifi-opt.conf。
要保留 802.11n，您可以尝试该11n_disable=8选项。
由此问答你可以试试：
sudo modprobe -r iwlwifi
sudo modprobe iwlwifi
如果这对当前会话有效，则可以将其设置为在启动时自动运行。