我的戴尔 Latitude 电脑上一直运行 14.10，但 Unity 突然出问题了。我重新安装了电脑，一切似乎都很好，只是只有从安装 CD 启动时才会显示“启用 Wifi”（并允许我连接到我的 wifi 网络）。从硬盘启动时，我的 wifi 网络列在“编辑连接”中，其设置与从 CD 启动时显示的设置相同，但我无法使用它。
我认为这不同于Wifi 在 Live CD 上可用，但从 HD 启动时不可用因为一周前它在同一台机器、BIOS 和 Ubuntu 版本上运行良好，而且当我运行 sudo lshw -C network 时没有出现“网络已禁用”的情况。
从 CD 启动时 lsmod 的输出太长了，我猜其中一个模块就是实现 wifi 连接的原因。有人能告诉我哪个模块以及如何使其成为硬盘系统的一部分吗？
sudo lshw -C network # 从 CD 启动后，连接到 wifi 之前
*-network
description: Ethernet interface
product: 82579LM Gigabit Network Connection
vendor: Intel Corporation
physical id: 19
bus info: pci@0000:00:19.0
logical name: eth0
version: 04
serial: 5c:26:0a:59:91:32
capacity: 1Gbit/s
width: 32 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=2.3.2-k firmware=0.13-3 latency=0 link=no multicast=yes port=twisted pair
resources: irq:43 memory:e2e00000-e2e1ffff memory:e2e80000-e2e80fff ioport:4080(size=32)
*-network
description: Network controller
product: BCM4313 802.11bgn Wireless Network Adapter
vendor: Broadcom Corporation
physical id: 0
bus info: pci@0000:02:00.0
version: 01
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: driver=bcma-pci-bridge latency=0
resources: irq:17 memory:e2d00000-e2d03fff
*-network
description: Wireless interface
physical id: 2
logical name: wlan0
serial: 74:de:2b:b4:5b:18
capabilities: ethernet physical wireless
configuration: broadcast=yes driver=brcmsmac driverversion=3.16.0-23-generic firmware=610.812 link=no multicast=yes wireless=IEEE 802.11bgn
sudo lshw -C network # 从 CD 启动并连接到 wifi 后
*-network
description: Ethernet interface
product: 82579LM Gigabit Network Connection
vendor: Intel Corporation
physical id: 19
bus info: pci@0000:00:19.0
logical name: eth0
version: 04
serial: 5c:26:0a:59:91:32
capacity: 1Gbit/s
width: 32 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=2.3.2-k firmware=0.13-3 latency=0 link=no multicast=yes port=twisted pair
resources: irq:43 memory:e2e00000-e2e1ffff memory:e2e80000-e2e80fff ioport:4080(size=32)
*-network
description: Network controller
product: BCM4313 802.11bgn Wireless Network Adapter
vendor: Broadcom Corporation
physical id: 0
bus info: pci@0000:02:00.0
version: 01
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: driver=bcma-pci-bridge latency=0
resources: irq:17 memory:e2d00000-e2d03fff
*-network
description: Wireless interface
physical id: 2
logical name: wlan0
serial: 74:de:2b:b4:5b:18
capabilities: ethernet physical wireless
configuration: broadcast=yes driver=brcmsmac driverversion=3.16.0-23-generic firmware=610.812 ip=192.168.0.79 link=yes multicast=yes wireless=IEEE 802.11bgn
sudo lshw -C network #从硬盘启动后
*-network
description: Ethernet interface
product: 82579LM Gigabit Network Connection
vendor: Intel Corporation
physical id: 19
bus info: pci@0000:00:19.0
logical name: eth0
version: 04
serial: 5c:26:0a:59:91:32
capacity: 1Gbit/s
width: 32 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=2.3.2-k firmware=0.13-3 latency=0 link=no multicast=yes port=twisted pair
resources: irq:42 memory:e2e00000-e2e1ffff memory:e2e80000-e2e80fff ioport:4080(size=32)
*-network UNCLAIMED
description: Network controller
product: BCM4313 802.11bgn Wireless Network Adapter
vendor: Broadcom Corporation
physical id: 0
bus info: pci@0000:02:00.0
version: 01
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: latency=0
resources: memory:e2d00000-e2d03fff
从硬盘启动时 lsmod：
Module Size Used by
psmouse 106593 0
ahci 34062 2
sdhci_pci 23301 0
e1000e 230184 0
libahci 32424 1 ahci
sdhci 43448 1 sdhci_pci
ptp 19445 1 e1000e
pps_core 19333 1 ptp
从 CD 启动时 lsmod：
Module Size Used by
arc4 12608 2
brcmsmac 571212 0
cordic 12574 1 brcmsmac
brcmutil 15579 1 brcmsmac
b43 400218 0
mac80211 660592 2 b43,brcmsmac
intel_rapl 18783 0
x86_pkg_temp_thermal 14205 0
intel_powerclamp 18786 0
dm_crypt 23172 0
coretemp 13441 0
kvm_intel 143514 0
snd_hda_codec_hdmi 47547 1
snd_hda_codec_idt 63632 1
cfg80211 510218 3 b43,brcmsmac,mac80211
snd_hda_codec_generic 68914 1 snd_hda_codec_idt
kvm 455570 1 kvm_intel
snd_hda_intel 30379 3
snd_hda_controller 35152 1 snd_hda_intel
snd_hda_codec 139675 5 snd_hda_codec_hdmi,snd_hda_codec_idt,snd_hda_codec_generic,snd_hda_intel,snd_hda_controller
snd_hwdep 17698 1 snd_hda_codec
crct10dif_pclmul 14307 0
snd_pcm 104102 4 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel,snd_hda_controller
dell_laptop 18227 0
dell_wmi 12761 0
crc32_pclmul 13133 0
dcdbas 14928 1 dell_laptop
ghash_clmulni_intel 13230 0
ssb 62366 1 b43
sparse_keymap 13948 1 dell_wmi
snd_seq_midi 13564 0
snd_seq_midi_event 14899 1 snd_seq_midi
aesni_intel 152552 0
joydev 17344 0
dm_multipath 22843 0
snd_rawmidi 30876 1 snd_seq_midi
aes_x86_64 17131 1 aesni_intel
lrw 13287 1 aesni_intel
gf128mul 14951 1 lrw
scsi_dh 14882 1 dm_multipath
glue_helper 13944 1 aesni_intel
bnep 19543 2
btusb 32448 0
serio_raw 13434 0
snd_seq 67224 2 snd_seq_midi_event,snd_seq_midi
mei_me 19742 0
snd_seq_device 14497 3 snd_seq,snd_rawmidi,snd_seq_midi
ablk_helper 13597 1 aesni_intel
bcma 52443 3 b43,brcmsmac
lpc_ich 21093 0
rfcomm 69509 8
cryptd 20360 3 ghash_clmulni_intel,aesni_intel,ablk_helper
mei 87931 1 mei_me
snd_timer 29513 2 snd_pcm,snd_seq
bluetooth 446190 22 bnep,btusb,rfcomm
snd 87611 17 snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_hda_codec_idt,snd_pcm,snd_seq,snd_rawmidi,snd_hda_codec_generic,snd_hda_codec,snd_hda_intel,snd_seq_device
shpchp 37040 0
dell_smo8800 13154 0
parport_pc 32741 0
soundcore 15052 2 snd,snd_hda_codec
ppdev 17671 0
6lowpan_iphc 18702 1 bluetooth
mac_hid 13227 0
lp 17759 0
parport 42299 3 lp,ppdev,parport_pc
squashfs 48362 1
overlayfs 27917 1
nls_utf8 12557 1
isofs 39837 1
dm_mirror 22040 0
dm_region_hash 20850 1 dm_mirror
dm_log 18411 2 dm_region_hash,dm_mirror
i915 917618 3
i2c_algo_bit 13406 1 i915
drm_kms_helper 61627 1 i915
psmouse 106548 0
sdhci_pci 23261 0
ahci 34062 1
libahci 32424 1 ahci
e1000e 230184 0
sdhci 43448 1 sdhci_pci
drm 310919 5 i915,drm_kms_helper
ptp 19445 1 e1000e
pps_core 19333 1 ptp
wmi 19193 1 dell_wmi
video 20128 1 i915
无论是从 CD 启动还是从硬盘启动，以下输出都相同
lspci -nnk | grep 14e4
02:00.0 Network controller [0280]: Broadcom Corporation BCM4313 802.11bgn Wireless Network Adapter [14e4:4727] (rev 01)
还有一点需要注意：当我用电缆将其直接连接到路由器时，它可以正常上网。
rfkill 列表全部无输出。
我按照说明清除了 bcmwl-kernel-source、更新并进行了新安装http://ubuntuforums.org/showthread.php?t=2214110。我在更新时确实看到了这一点：
DKMS: install completed.
modprobe: ERROR: ../libkmod/libkmod.c:557 kmod_search_moddep() could not open moddep file '/lib/modules/3.16.0-30-generic/modules.dep.bin'
update-initramfs: deferring update (trigger activated)
Processing triggers for initramfs-tools (0.103ubuntu8) ...
update-initramfs: Generating /boot/initrd.img-3.16.0-23-generic
谢谢，
鲍勃
答案1
您可能需要安装 linux-firmwaresudo apt-get install linux-firmware并可能删除几个模块，请查看帖子http://ubuntuforums.org/showthread.php?t=2214110请参阅特殊情况 #1 以了解更多详细信息
如果有效的话，谢谢 Chili555
答案2
我的笔记本电脑也出现了同样的问题，我为重新安装 ubuntu 而生气。我尝试了所有包含“WIFI”的解决方案。但过了很长时间，我偶然发现了一个页面，其中提到了apt-get update和之间的区别apt-get upgrade。所以我试了一下。瞧！重启后我的 Wifi 奇迹般地恢复了。所以对于像我这样安装了过时的 ubuntu 副本的新 Linux 用户来说，在继续其他解决方案之前，请先执行以下操作。
sudo apt-get update
sudo apt-get upgrade
希望这能有所帮助！希望我不会因为这么简单的答案而被否决。