Disabling MAC address randomization may sometimes be required to obtain a connection. MAC address randomization is enabled by default in Network Manager. It may be disabled by adding the following lines to /etc/NetworkManager/NetworkManager.conf
[device]
wifi.scan-rand-mac-address=no
Save the changes and reboot.
How can I do that.
I tried to type this in Terminal but nothing happened
Are you in you gui desktop. which desktop do you use.
gnome
Open the following file in your text editor.
/etc/NetworkManager/NetworkManager.conf
paste these lines into the open document:
[device]
wifi.scan-rand-mac-address=no
Save the modified file with your sudo password and then reboot.
it's already there
Really, that surprises me because your the first one to tell me that. I've suggested it quite often, maybe its become the default again.
please post
rfkill list all
journalctl -p err -b
journalctl -u NetworkManager -b
You might want to post the last one on paste bin.
I had this same issue a year ago as I mentioned in post 11
but back then my newly installed wifi was not working it was working with other wifi's so to solved this problem I installed my old router
so my laptop was working with every wifi it was connecting with every router and hotspot
but this time none of wireless network is showing and sometime wifi icon is not even showing
Are you using the broadcom-wl driver.
I am using wl which is I guess linux414-broadcom-wl
I honestly didn't mark this thread as solved
because when you marked a thread as solved it looks like following screenshot
but it looks like as solved 
and Now I am wondering if it is marked as solved should I start it again??
This will test out the driver that comes pre-installed in the kernel. This is only a temporary test, it will only last till you reboot.
Try each of these commands individually, one after the another:
sudo modprobe -r wl
sudo modprobe brcmsmac
sudo systemctl stop NetworkManager; sleep 5; sudo systemctl start NetworkManager
Those commands will hopefully unload the wl driver, load the built in kernel driver, and restart network manager.
If any command returns an error please post it here.
modprobe -r wl
modprobe: ERROR: could not remove 'wl': Operation not permitted
modprobe brcmsmac
modprobe: ERROR: could not insert 'brcmsmac': Operation not permitted
Network manager command worked but wifi still not showing
sorry I will edit, requires sudo
It wasn't someone edited the title and just put in [Solved], I've removed it.
It was solved , but it only lasted a day. 
Please repeat the commands I posted again, with sudo.
sudo modprobe -r wl
sudo modprobe brcmsmac
sudo systemctl stop NetworkManager; sleep 5; sudo systemctl start NetworkManager
Do I have to reboot the system
because this time commands gave no error but wifi icon disappeared from Network Manager
Please do not do anything I do not specifically ask you to do
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