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Since I bought a new laptop, during already two years, I have endless problems with WiFi on my laptop (Lenovo Y50-70) on Ubuntu (16.04, 18.04).

Firstly, it always disconnects from connections, such as eduroam or any other enterprise connections. I tried maaany things to solve it, but none of them worked:

• Change IPv6 to Ignore/Disable


• 
  Installing/reinstalling wifi drivers (I have broadcom wifi card)


• Connecting to the specific access point (iwlist scan and choosing the best connection according to the signal strength)


• Adding b43 to blacklist


• Disabling Secure Boot


• Using Wicd Network Manager


• And many many other things found in stackoverflow or elsewhere...

My WiFI card details:

08:00.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM4352 802.11ac Wireless Network Adapter [14e4:43b1] (rev 03)

Subsystem: Lenovo BCM4352 802.11ac Wireless Network Adapter [17aa:0623]

Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-

Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-

Latency: 0, Cache Line Size: 64 bytes

Interrupt: pin A routed to IRQ 17

Region 0: Memory at d1600000 (64-bit, non-prefetchable) [size=32K]

Region 2: Memory at d1400000 (64-bit, non-prefetchable) [size=2M]

Capabilities: <access denied>

Kernel driver in use: wl

Kernel modules: bcma, wl

Now, I was trying to play with drivers etc... And endup with a biger problem. Now, when I connect to the eduroam I can use it for 5-10 minutes after it disconnects and never connects back, also all wifi connections disappears. In the syslog, on disconnect I caught this error: https://pastebin.com/FxP7PmPn
To connect again I need to unbind and bind again wl driver:

sudo rmmod wl



sudo modprobe wl

Maybe someone can explain why it happens to me? Is it possible to fix? I really tired of that for 2 years...

Some details:

• Laptop: Lenovo Y50-70


• OS: Ubuntu 18.04 LTS


• I have dual boot with
  Windows 10


• 
  

  I installed wifi drivers using command:

  
  
  

  apt-get install bcmwl-kernel-source 
  
  

  
  

If you need more details - let me know.

Also this (output from command rfkill list all):

2: ideapad_wlan: Wireless LAN

    Soft blocked: no

    Hard blocked: no

3: ideapad_bluetooth: Bluetooth

    Soft blocked: no

    Hard blocked: no

4: hci0: Bluetooth

    Soft blocked: no

    Hard blocked: no

11: phy3: Wireless LAN

    Soft blocked: no

    Hard blocked: no

12: brcmwl-0: Wireless LAN

    Soft blocked: no

    Hard blocked: no

Thank you for any kind of help.

UPDATE:
I bought TP-Link (TL-WN725N) wifi usb adapter and tried to use it with eduroam networks. I can confirm that the problem is still the same - it disconnects after some time and it's very difficult to connect again. I need to restart network-manager several times or unload and load r8188eu module. Of course, there are no errors in the syslog which I posted above, but still...

FINALLY. I can confirm that since two years I finally fixed my wifi problem. The solution was actually super easy and near to me: I had to change REGDOMAIN in crda (I had there different country code):

1. sudo -H gedit /etc/default/crda




2. REGDOMAIN=<YOUR COUNTRY CODE>




3. reboot (mandatory!!)

You can take your country code from here.

To sum up, I'm using bcmwl-kernel-source wl driver for my Broadcom BCM4352 card. (good info/tutorial about it is here). I still receive sometimes those errors and have few small timeouts for ~1 second (no disconnects!), but I think it's natural and it doesn't bother me compared to what I had before...

I had this problem, my wifi connection was extremely slow while it worked on Windows. After trying several suggestions on the internet, the wifi disappeared after a time running and it only came back after restarting the laptop. The following worked like a charm for me (no problems since knocks on wood):

sudo modprobe -r rtl8723de && sleep 5 && sudo modprobe rtl8723de ant_sel=1

or if that doesn't work:

sudo modprobe -r rtl8723de && sleep 5 && sudo modprobe rtl8723de ant_sel=2

it was fixed.

this page may be of help to you. One thing that may help also is if it's a uefi machine you need to disable secure boot.