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Ubuntu 18.04 更新后 Wi-Fi 无法使用

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Ubuntu 18.04 更新后 Wi-Fi 无法使用

我在 Dell Precision M6400 上运行 Ubuntu 18.04。首次安装 18.04 时，WiFi 运行良好。自动更新后，WiFi 不再正常运行。WLAN 点显示正确，但尝试连接时，大约 1 分钟后失败，并显示一条消息：连接失败。已更新和升级，但未成功。看起来，更新后驱动程序/固件不再正确。有什么提示吗？

$ lspci -knn | grep -i net -A3
09:00.0 Ethernet controller [0200]: Broadcom Limited NetXtreme BCM5761e Gigabit Ethernet PCIe [14e4:1680] (rev 10)
    Subsystem: Dell NetXtreme BCM5761e Gigabit Ethernet PCIe [1028:0251]
    Kernel driver in use: tg3
    Kernel modules: tg3
0c:00.0 Network controller [0280]: Intel Corporation WiFi Link 5100 [8086:4232]
    Subsystem: Intel Corporation WiFi Link 5100 AGN [8086:1321]
    Kernel driver in use: iwlwifi
    Kernel modules: iwlwifi

--

$ rfkill list
0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
1: dell-wifi: Wireless LAN
    Soft blocked: no
    Hard blocked: no
2: dell-bluetooth: Bluetooth
    Soft blocked: no
    Hard blocked: no
3: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no

$ uname -r
4.15.0-33-generic

切换回内核 4.15.0.32.35 后，它无法检测到 wifi 适配器，也无法启动驱动程序 iwlwifi。

$ lspci -knn | grep -i net -A3
09:00.0 Ethernet controller [0200]: Broadcom Limited NetXtreme BCM5761e
Gigabit Ethernet PCIe [14e4:1680] (rev 10)
    Subsystem: Dell NetXtreme BCM5761e Gigabit Ethernet PCIe [1028:0251]
    Kernel driver in use: tg3
    Kernel modules: tg3
0c:00.0 Network controller [0280]: Intel Corporation WiFi Link 5100 [8086:4232]
    Subsystem: Intel Corporation WiFi Link 5100 AGN [8086:1321]

$ rfkill list
$

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