The new broadcom wifi module wl is buggy, so I read somewhere that installing an older version of bcmwl (bcmwf-kernel-source 6.30.223.141) fixes the problem. I downloaded the deb from here. Then installed it using sudo dpkg -i *.deb and it shows
(Reading database ... 158905 files and directories currently installed.)
Preparing to unpack bcmwl-kernel-source_6.30.223.141+bdcom-0ubuntu1_amd64.deb ...
Removing all DKMS Modules
Done.
Unpacking bcmwl-kernel-source (6.30.223.141+bdcom-0ubuntu1) over (6.30.223.141+bdcom-0ubuntu1) ...
Setting up bcmwl-kernel-source (6.30.223.141+bdcom-0ubuntu1) ...
Loading new bcmwl-6.30.223.141+bdcom DKMS files...
Building only for 4.8.0-36-generic
Building for architecture x86_64
Building initial module for 4.8.0-36-generic
Error! Bad return status for module build on kernel: 4.8.0-36-generic (x86_64)
Consult /var/lib/dkms/bcmwl/6.30.223.141+bdcom/build/make.log for more information.
modprobe: FATAL: Module wl not found in directory /lib/modules/4.8.0-36-generic
update-initramfs: deferring update (trigger activated)
Processing triggers for initramfs-tools (0.122ubuntu8.8) ...
update-initramfs: Generating /boot/initrd.img-4.8.0-36-generic
W: Possible missing firmware /lib/firmware/i915/kbl_dmc_ver1_01.bin for module i915
W: Possible missing firmware /lib/firmware/i915/kbl_guc_ver9_14.bin for module i915
W: Possible missing firmware /lib/firmware/i915/bxt_guc_ver8_7.bin for module i915
and output of
/var/lib/dkms/bcmwl/6.30.223.141+bdcom/build/make.log
is here.
Kernel version - 4.8.0-36-generic
wifi driver - Broadcom Corporation BCM43142 802.11b/g/n (rev 01)
OS - Kubuntu 16.04.2 LTS (Xenial Xerus)
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