Hi, I can’t get my wifi to work after several different tries. Here is my inxi:
~ inxi -N 
Network:
Device-1: Realtek RTL810xE PCI Express Fast Ethernet driver: r8169
Device-2: Broadcom BCM43142 802.11b/g/n driver: bcma-pci-bridge
~
Welcome @LibertyMom. Can you provide a little more information about what you have tried so far?
What desktop environment are you using?
What network are you trying to connect to? Are you at home? Are there other devices connected to the network?
What is the output of:
nmcli g
and
nmcli r
Thank you for your help.
I have tried backing the kernel to 5.10.89-1,
Does the WiFi pick up from a cold boot? Not a reboot–complete shutdown, wait a couple seconds, then boot back up.
Let me try it and I’ll let you know.
No, it doesn’t. Here’s a screenshot of the connection I tried to add myself.
Oops, can’t send a screenshot yet apparently.
That is odd that you are not getting a connection, because your nmcli output suggests that you are connected.
What type of error message are you getting when you try to connect?
When I unplug my ethernet cable, it says “no available connections.”
Thank you, BluishHumility for your help. Unfortunately, I have to get to sleep, so I will need to continue this tomorrow. Again, thank you for taking the time. If you think of any ideas, please let me know.
No worries, I’m sure we’ll get it sorted out. 
In terminal:
pamac install linux510-broadcom-wl
substitute to install appropriate kernel version, e.g linux515-broadcom-wl
install appropriate linux headers as well for good measure
pamac install linux510-headers or linux515-headers as appropriate
Should be available in mhwd…
What @jrichard326 said, and if it still doesn’t work, please see, [HowTo] Provide System Information and, if applicable, [HowTo] post screenshots and links
Edit:
And, in addition to what @jrichard326 said, I’d recommend you rather use the -dkms driver, as this survives kernel rebuilds. And it seems to be available in the community repositories:
$ pamac search broadcom
[...]
broadcom-wl-dkms 6.30.223.271-28 community
Broadcom 802.11 Linux STA wireless driver
So, should theoretically be installable with:
pamac install broadcom-wl-dkms
Or, that’s the theory, anyway.
Thank you jichard326, it worked!
I appreciate your time very much.
Thanks for helping a frustrated noob. 
Thank you for your help. I’m happy to report that jrichard325’s solution worked. I’m untethered! 
I’m genuinely happy it worked!
However, remember that his option isn’t dkms so definitely won’t survive ALL updates. It might some, I’m not 
on that, but it won’t all. Especially involving your kernel. So you might need to rebuild the driver after updates, and definitely when changing kernel versions.
My experience with these (linux515-broadcom-wl) on two older computers, is that when they update the kernel these are automatically updated whether on Stable Branch or any other branch that I have used. They are in the official repositories (extra).
That’s excellent! As I mentioned, it would probably survive some updates, but not all.
For example, I think it might survive an update from kernel 5 version 5.13 to version 5.16, but I highly doubt a driver installed for, let’s say, version 4.14 will be good with an upgrade to kernel version 5.4. Or even 4.19.
Or something like that, anyway.
Which would have been true using
sudo mhwd -i pci network-broadcom-wl
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