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I updated kernel to 4.2 in Ubuntu 14.04 by running

sudo apt-get install linux-generic-lts-wily

My wifi is not working but my ethernet is working. Please help me out.

Output of lspci -knn | grep Net -A2 is:

08:00.0 Network controller [0280]: Broadcom Corporation BCM43142 802.11b/g/n [14e4:4365] (rev 01)
    Subsystem: Hewlett-Packard Company Device [103c:2230]
09:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 10)
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  • Please edit your question and add output of lspci -knn | grep Net -A2 terminal command.
    – Pilot6
    Feb 24 '16 at 14:00
  • I have edited my question @Pilot6
    – Siddhant
    Feb 24 '16 at 14:05
  • Do you ever update your system?
    – Pilot6
    Feb 24 '16 at 14:07
  • For wireless troubleshooting please run the command suggested in this answer, put the output in pastebin.com or paste.ubuntu.com, and link the paste in your question.
    – TheSchwa
    Feb 24 '16 at 14:08
  • It is not needed any more.
    – Pilot6
    Feb 24 '16 at 14:12
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It looks like the Broadcom driver was not updated for kernel 4.2, or you never updated your system. Anyway you can install it this way:

wget http://mirrors.kernel.org/ubuntu/pool/restricted/b/bcmwl/bcmwl-kernel-source_6.30.223.248+bdcom-0ubuntu7_amd64.deb
sudo dpkg -i bcmwl-kernel-source_6.30.223.248+bdcom-0ubuntu7_amd64.deb
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