1- Do update and upgrade as always.
apt-get update && apt-get upgrade && apt-get dist-upgrade -y
2- Install headers.
apt-get install linux-headers-`uname -r`
3-Install synaptic.
apt-get install synaptic -y
4-Open synaptic and type "bcm43142" and search.
5-U'll see 3 different drivers.
broadcom-sta-common
broadcom-sta-dkms
broadcom-sta-source
6-Mark for installation to broadcom-sta-dkms and install it.
7-Reboot.
Read more at https://www.inforge.net/xi/threads/ls-cannot-access-sys-class-ieee80211-no-such-file-or-directory.454606/#jT8ThY4bq4BrwUHh.99
安裝后依然沒有解決....
但是不必擔心，在掛載成功無線網卡后，並沒有任何影響。