转载地址：https://blog.csdn.net/sc_lilei/article/details/79545524?utm_source=blogxgwz4
装完系统后， $sudo apt-get upgrade
系统版本内核变为：
jxl@lenovo:~$ uname -a
Linux lenovo 4.4.0-138-generic #164~14.04.1-Ubuntu SMP Fri Oct 5 08:56:16 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
jxl@lenovo:~$ lspci |grep Network
03:00.0 Network controller: Qualcomm Atheros Device 0042 (rev 31)
插上网线后，可以上网；但是右上角的wifi 标志提示被硬件blocked;
sudo rfkill list all可以看到状态wlan的hard blocked为yes，注意没有网上说的3: phy00: ideapad_wlan: Wireless LANSoftblocked: noHardblocked: yes1: ideapad_bluetooth: BluetoothSoftblocked: yesHardblocked: yes2: hci0: BluetoothSoftblocked: yesHardblocked: no
试了很多帖子，都不行，最后按照这篇帖子 成功。
https://blog.csdn.net/sc_lilei/article/details/79545524?utm_source=blogxgwz4
1、检查无线网卡类型：lspci |grep Network ,返回Network controller:Qualcomm Atheros Device 0042(rev 31)，由此确认是高通的网卡。（若是Broade....字样则是博通，此处暂不涉及。）
2、下载软件包1【backports-4.4.2-1.tar】软件包2【linux-firmware_1.169.3_all.deb】，可通过手机蓝牙共享网络给电脑临时联网，没有蓝牙就只能有线或再找一台电脑。接着打开终端运行以下命令
sudo apt-get install build-essential linux-headers-$(uname -r) gitecho "options ath10k_core skip_otp=y" | sudo tee /etc/modprobe.d/ath10k_core.conftar -zxvf backports-4.4.2-1.tar.gz （进入软件包所在目录操作）cd backport-4.4.2-1sudo make defconfig-wifisudo makesudo make installgit clone https://github.com/kvalo/ath10k-firmware.gitsudo cp -r ath10k-firmware/QCA9377 /lib/firmware/ath10k/sudo cp /lib/firmware/ath10k/QCA9377/hw1.0/WLAN.TF.1.0/firmware-5.bin_WLAN.TF.1.0-00002-QCATFSWPZ-5 /lib/firmware/ath10k/QCA9377/hw1.0/firmware-5.bin （先确认要复制的文件是存在的）sudo dpkg -i linux-firmware_1.169.3_all.deb (进入软件包所在目录操作)sudo reboot发现还是不OK，然后：
$ rfkill list all0: ideapad_wlan: Wireless LANSoftblocked: noHardblocked: yes1: ideapad_bluetooth: BluetoothSoftblocked: yesHardblocked: yes2: hci0: BluetoothSoftblocked: yesHardblocked: no3: phy0: Wireless LANSoftblocked: noHardblocked: no发现这时有了 phy0，
因为被联想的模块ideapad_laptop给硬件禁止了，卸载掉该模块之后，WiFi就正常了。sudo modprobe -r ideapad_laptop重启后，仍然有ideapad_laptop，因此需要把它加入到黑名单里即可。在/etc/modprobe.d/新建一个ideapad.conf，该文件内容如下：blacklist ideapad_laptop再重启，发现右上角的wifi 图标可以正常显示了。
jxl@lenovo:~$ rfkill list all
0: hci0: BluetoothSoft blocked: noHard blocked: no
1: phy0: Wireless LANSoft blocked: noHard blocked: no
jxl@lenovo:~$
这时发现一个有意思的现象，之前装过一个wicd network manager, 发现在这个软件中还是检测不到wifi
安装wicd的命令：
https://www.howtoinstall.co/en/ubuntu/trusty/wicd-gtk（Ubuntu14.04）
Install wicd-gtk
Installing wicd-gtk package on Ubuntu 14.04 (Trusty Tahr) is as easy as running the following command on terminal:sudo apt-get update
sudo apt-get install wicd-gtkhttps://www.howtoinstall.co/en/ubuntu/xenial/wicd（Ubuntu16.04）
Install wicd
Installing wicd package on Ubuntu 16.04 (Xenial Xerus) is as easy as running the following command on terminal:sudo apt-get update
sudo apt-get install wicd
