Ubuntu20网络连接问题（针对broadcom网卡）
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安装Ubuntu 20.04网络连接问题（只针对broadcom网卡的解决方法）
安装了windows 和Linux双系统后发现windows 可以正常上网， ubuntu的网络连接出了问题，总是反复要求输入wifi密码， 网上各种都是修改dns的方法， 想来想去只能粗暴重装网卡驱动， 最后在国外的网站上找到了可以离线安装博通网卡驱动的详细方法链接
需要的材料：一台可以正常上网的电脑和一个u盘，双系统直接切换到windows系统下载好需要的文件就行
查看电脑的网卡型号的方法：在terminal输入lspci
根据网卡的型号找到对应的需要的包
PCI.ID 18.04 LTS 20.04+
------------------------------------------------------------------------------------
14e4:0576 Special Case #1 UNKNOWN
14e4:165f UNKNOWN UNKNOWN
14e4:1713 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4301 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4306 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4306 rev 02 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4306 rev 03 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4307 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4311 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4311 rev 01 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4312 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4313 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4315 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4315 rev 01 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4318 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4318 rev 02 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4319 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4320 rev 02 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4320 rev 03 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4321 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4324 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4325 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4328 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4328 rev 03 bcmwl-kernel-source bcmwl-kernel-source
14e4:4329 bcmwl-kernel-source bcmwl-kernel-source
14e4:432a bcmwl-kernel-source bcmwl-kernel-source
14e4:432b bcmwl-kernel-source bcmwl-kernel-source
14e4:432c bcmwl-kernel-source bcmwl-kernel-source
14e4:432d bcmwl-kernel-source bcmwl-kernel-source
14e4:4331 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4335 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4350 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4353 Special Case #1 UNKNOWN
14e4:4353 rev 01 Special Case #1 UNKNOWN
14e4:4357 Special Case #1 UNKNOWN
14e4:4358 bcmwl-kernel-source bcmwl-kernel-source
14e4:4359 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4360 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4365 firmware-b43-installer firmware-b43-installer / linux-firmware
14e4:4365 rev 01 bcmwl-kernel-source bcmwl-kernel-source
14e4:43a0 bcmwl-kernel-source bcmwl-kernel-source
14e4:43ae rev 02 UNKNOWN UNKNOWN
14e4:43b1 bcmwl-kernel-source bcmwl-kernel-source
14e4:43b1 rev 03 bcmwl-kernel-source bcmwl-kernel-source
14e4:43c3 rev 04 UNKNOWN firmware-b43-installer / linux-firmware / Special Case #2
14e4:4727 bcmwl-kernel-source bcmwl-kernel-source
14e4:4727 rev 01 Special Case #1 Special Case #1
14e4:a962 firmware-b43-installer firmware-b43-installer / linux-firmware
比如我的网卡型号是14e4:43c3 rev 04， 需要firmware-b43-installer 和linux-firmware，这里有另外一个答案提供了离线安装的方法firmware-b43-installer offline
已经安装了bcmwl-kernel-source 要记得先卸载再安装firmware-b43-installer
另外因为我这个网卡型号比较特殊，所以还需要一些额外的操作。
14e4:43c3 rev 04 驱动离线安装：
-
2.用u盘把文件复制到ubuntu系统的home文件夹中
-
3.打开terminal，将以下命令依次复制到terminal中
sudo dpkg -i b43-fwcutter_015-9_amd64.deb
tar xfvj broadcom-wl-5.100.138.tar.bz2
sudo b43-fwcutter -w /lib/firmware broadcom-wl-5.100.138/linux/wl_apsta.o
sudo modprobe b43
sudo cp brcmfmac4366c-pcie.bin /lib/firmware/brcm/brcmfmac4366c-pcie.bin
-
4.输入命令
sudo nano /etc/rc.local
在打开的文件中输入modprobe brcmfmac 并保存 -
5.重启，驱动安装好了，网速快到飞起，可以愉快冲浪了
对于网络连接不稳定和wifi突然消失也可以用重装驱动的方法试一下，大概率都能解决问题
声明：本文转载自https://blog.csdn.net/yuanyOo0/article/details/113373095，原文出自https://askubuntu.com/questions/55868/installing-broadcom-wireless-drivers
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