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以下是在ubuntu18.04系统中安装wifi驱动rtl8723be的心得。
问题起因 在自动升级linux内核后，重新启动ubuntu18.04后wifi驱动就失效了，需要重新安装，是因为使用了常规方式安装rtl8723be wifi驱动。
以下为在ubuntu18.04下安装rtl8723be驱动的步骤（常规方式） 1、先安装好需要编译的软件： sudo apt-get install linux-headers-generic linux-headers-$(uname -r) gcc g++ build-essential git 2、cd切换到需要放rtlwifi_new 到目录下，再执行： git clone http://github.com/lwfinger/rtlwifi_new.git
3、先停止网路 sudo service network-manager stop 如果不是首次安装该驱动，在第3步后执行： $ sudo modprobe -rfv rtl8723be 删除卸载老的无线网卡驱动。 4、cd 到 rtlwifi_new 目录下执行： sudo make sudo make install sudo modprobe -v rtl8723be fwlps=0 ips=0 5、重新启动ubuntu18.04系统 sudo reboot 6、确认是否关闭 fwlps=N ips=N systool -v -m rtl8723be 7、如果查看 fwlps=Y ips=Y 的话就： echo "options rtl8723be ips=0 fwlps=0" | sudo tee /etc/modprobe.d/rtl8723be.conf 这样首次安装rtl8723be驱动就完成了。但是这样方式安装有遗留问题，即自动升级内核后，重启系统该wifi驱动会失效，需要重新安装wifi驱动。
使用dkms方式安装rtl8723be wifi驱动 我们可以这样利用dkms自动更新和升级内核都不需要reinstall wifi driver. 先需要安装dkms，命令为： sudo apt install dkms 1、git 下载rtlwifi_new git clone -b extended https://github.com/lwfinger/rtlwifi_new.git 2、复制rtlwifi_new到/usr/src/ 目录下 sudo cp -R rtlwifi_new/ /usr/src/ 3、dkms add cmd@TR:/usr/src$ sudo dkms add ./rtlwifi_new Creating symlink /var/lib/dkms/rtlwifi-new/0.6/source ->/usr/src/rtlwifi-new-0.6 DKMS: add completed. 4、dkms install cmd@TR:/usr/src$ sudo dkms install rtlwifi-new/0.6 Kernel preparation unnecessary for this kernel. Skipping... Building module: cleaning build area....(bad exit status: 2) make -j8 KERNELRELEASE=4.15.0-34-generic -C /lib/modules/4.15.0-34-generic/build M=/var/lib/dkms/rtlwifi-new/0.6/build.............. cleaning build area...(bad exit status: 2) DKMS: build completed. rtl_pci.ko: Running module version sanity check. - Original module - Installation - Installing to /lib/modules/4.15.0-34-generic/updates/dkms/ rtl_usb.ko: Running module version sanity check. - Original module - Installation - Installing to /lib/modules/4.15.0-34-generic/updates/dkms/ rtlwifi.ko: Running module version sanity check. - Original module - Installation - Installing to /lib/modules/4.15.0-34-generic/updates/dkms/ btcoexist.ko: Running module version sanity check. - Original module - Installation - Installing to /lib/modules/4.15.0-34-generic/updates/dkms/ halmac.ko: Running module version sanity check. - Original module - Installation - Installing to /lib/modules/4.15.0-34-generic/updates/dkms/ phydm_mod.ko: Running module version sanity check. - Original module - Installation - Installing to /lib/modules/4.15.0-34-generic/updates/dkms/ rtl8188ee.ko: Running module version sanity check. - Original module - Installation - Installing to /lib/modules/4.15.0-34-generic/updates/dkms/ rtl8192c-common.ko: Running module version sanity check. - Original module - Installation - Installing to /lib/modules/4.15.0-34-generic/updates/dkms/ rtl8192ce.ko: Running module version sanity check. - Original module - Installation - Installing to /lib/modules/4.15.0-34-generic/updates/dkms/ rtl8192cu.ko: Running module version sanity check. - Original module - Installation - Installing to /lib/modules/4.15.0-34-generic/updates/dkms/ rtl8192de.ko: Running module version sanity check. - Original module - Installation - Installing to /lib/modules/4.15.0-34-generic/updates/dkms/ rtl8192ee.ko: Running module version sanity check. - Original module - Installation - Installing to /lib/modules/4.15.0-34-generic/updates/dkms/ rtl8192se.ko: Running module version sanity check. - Original module - Installation - Installing to /lib/modules/4.15.0-34-generic/updates/dkms/ rtl8723ae.ko: Running module version sanity check. - Original module - Installation - Installing to /lib/modules/4.15.0-34-generic/updates/dkms/ rtl8723be.ko: Running module version sanity check. - Original module - Installation - Installing to /lib/modules/4.15.0-34-generic/updates/dkms/ rtl8723de.ko: Running module version sanity check. - Original module - Installation - Installing to /lib/modules/4.15.0-34-generic/updates/dkms/ rtl8723-common.ko: Running module version sanity check. - Original module - Installation - Installing to /lib/modules/4.15.0-34-generic/updates/dkms/ rtl8821ae.ko: Running module version sanity check. - Original module - Installation - Installing to /lib/modules/4.15.0-34-generic/updates/dkms/ rtl8822be.ko: Running module version sanity check. - Original module - Installation - Installing to /lib/modules/4.15.0-34-generic/updates/dkms/ depmod... DKMS: install completed. 5、复制编译生成的相关到 /lib/firmware/rtlwifi/ cmd@TR:/usr/src$ sudo cp /usr/src/rtlwifi-new-0.6/firmware/rtlwifi/* /lib/firmware/rtlwifi/ 6、sudo depmod -a 7、echo "options rtl8723be ips=0 fwlps=0" | sudo tee /etc/modprobe.d/rtl8723be.conf 8、sudo modprobe -v rtl8723be fwlps=0 ips=0 9、重启：sudo reboot 注：使用dkms安装wifi驱动rtl8723be不会出现任何遗留问题。
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