Ubuntu 16.04, Acer Laptop, Broadcom Driver and Wifi Cannot Be Enabled

In my experience the problem comes up for either of two reasons, or both:secure boot in the boot set-up utility is enabled. It should be disabled instead. Thanks to user Pilot6 for pointing this out in the comments above.a new kernel does not cope well with the network and wi-fi settings. In my case the solution 1 works with kernel 3.19.0-77-generic or 4.4.0-45-generic, but not with the later 4.4.0-53-generic. To splash into an older reliable kernel, at boot time I go into the 'Advanced Ubuntu Options' of the boot loader rather than using the standard 'Ubuntu'. I am presented with this choice at restart since I have a dual boot system: if you don't, you can press the shift key at boot time to have this choice presented to you.

See for a way to select an earlier kernel version as boot-time default automatically, using Grub Customizer. To know which kernel the system is running on type uname -r in the command line (the output is a subset of uname -a).This problem occurred with both Ubuntu 14.04 and 16.04. I then presume that the release specification is immaterial.

Ingredients

Laptop Acer Aspire V11 Touch

Ubuntu 16.04 (kernel 4.4.0-45)

Additional driver 'Broadcom 802.11 Linux STA wireless device' in use

lspci -knn | grep Net -A2 02:00.0 Network controller : Broadcom Limited BCM43142 802.11b/g/n e4: (rev 01) Subsystem: Foxconn International, Inc. BCM43142 802.11b/g/n b:e07e] Kernel modules: bcma, wl

rfkill list 0: acer-wireless: Wireless LAN Soft blocked: no Hard blocked: no 1: acer-bluetooth: Bluetooth Soft blocked: no Hard blocked: no 2: hci0: Bluetooth Soft blocked: no Hard blocked: no

Issue

I cannot see any option to enable the wireless device from the applet main menu bar. As a result I cannot activate and use the wi-fi.

Research

I am almost-fully aware of this extensive post on Installing Broadcom Wireless Drivers, but installation is not the point. However, I have followed the uninstall/install sequence:

sudo apt-get purge bcmwl-kernel-source

sudo apt update

sudo update pciids

sudo apt install firmware-b43-install

sudo reboot

sudo apt install bcmwl-kernel-source # corresponds to my PCI id 14e4:4365 (rev 01)

sudo rfkill unblock all # for good measure

to no avail. Note that at sudo apt install bcmwl-kernel-source a dialogue window asks permission to disable Secure Boot by typing an ad hoc password. It claims it will be asked later, although I did not see it being asked again.

Interestingly, from this bounty-winning answer I could see with lspci -nn | grep -i BCM that my network controller is a BCM43142 that might not be supported by the STA driver. This is way too esoteric for me, but it may provide a clue to the expert.

I am also aware of other posts that deal with earlier Ubuntu versions, but I would dearly avoid guesswork and find an answer that applies to 16.04 safely.

Question

Please could you provide a list of simple steps to regain the possibility to enable the wifi from the menu bar?

If you need to refer to verbose posts, please indicate which answer is applicable according to you and in which way it integrates the actions undertaken above.

·OTHER ANSWER:

Ingredients

Laptop Acer Aspire V11 Touch

Ubuntu 16.04 (kernel 4.4.0-45)

Additional driver 'Broadcom 802.11 Linux STA wireless device' in use

lspci -knn | grep Net -A2 02:00.0 Network controller : Broadcom Limited BCM43142 802.11b/g/n e4: (rev 01) Subsystem: Foxconn International, Inc. BCM43142 802.11b/g/n b:e07e] Kernel modules: bcma, wl

rfkill list 0: acer-wireless: Wireless LAN Soft blocked: no Hard blocked: no 1: acer-bluetooth: Bluetooth Soft blocked: no Hard blocked: no 2: hci0: Bluetooth Soft blocked: no Hard blocked: no

Issue

I cannot see any option to enable the wireless device from the applet main menu bar. As a result I cannot activate and use the wi-fi.

Research

I am almost-fully aware of this extensive post on Installing Broadcom Wireless Drivers, but installation is not the point. However, I have followed the uninstall/install sequence:

sudo apt-get purge bcmwl-kernel-source

sudo apt update

sudo update pciids

sudo apt install firmware-b43-install

sudo reboot

sudo apt install bcmwl-kernel-source # corresponds to my PCI id 14e4:4365 (rev 01)

sudo rfkill unblock all # for good measure

to no avail. Note that at sudo apt install bcmwl-kernel-source a dialogue window asks permission to disable Secure Boot by typing an ad hoc password. It claims it will be asked later, although I did not see it being asked again.

Interestingly, from this bounty-winning answer I could see with lspci -nn | grep -i BCM that my network controller is a BCM43142 that might not be supported by the STA driver. This is way too esoteric for me, but it may provide a clue to the expert.

I am also aware of other posts that deal with earlier Ubuntu versions, but I would dearly avoid guesswork and find an answer that applies to 16.04 safely.

Question

Please could you provide a list of simple steps to regain the possibility to enable the wifi from the menu bar?

If you need to refer to verbose posts, please indicate which answer is applicable according to you and in which way it integrates the actions undertaken above.

Ubuntu 16.04, Acer Laptop, Broadcom Driver and Wifi Cannot Be Enabled 1

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