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I have Ubuntu 18.04. Occasionally my laptop can not connect to WiFi. I tried a lot of answers but none works for me. Yesterday I tried to play a video I know that has sound but it was silent. Should I reinstall Ubuntu or there's another way to make things run? I tried 

sudo apt-get update
sudo apt-get upgrade

I have Broadcom for WiFi.

for audio system 

sudo apt install ubuntu-restricted-extras

then pavucontrol I didn't find it so I run sudo apt install pavucontrol

For WiFi sudo update-pciids sudo apt install firmware-b43-installer Then Reboot the laptop and every thing is fine.

Sara Shokry
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1 Answers1

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I think there are two different (and independent) problems:

  • Wifi - it is important to use the correct proprietary driver for your model of Broadcom hardware. See this link,

    Installing Broadcom Wireless Drivers

  • Playing video - you probably need the correct codec for the sound-track, try again after installing the 'restricted extras'

    sudo apt update
sudo apt install ubuntu-restricted-extras

    It is also possible that you need to tweak the settings for the audio system with

    pavucontrol
sudodus
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  • I got an error.

    depmod...(bad exit status: 135)

    DKMS: uninstall completed. Error! Problems with depmod detected. Automatically uninstalling this module. DKMS: Install Failed (depmod problems). Module rolled back to built state. dpkg: error processing package bcmwl-kernel-source (--configure): installed bcmwl-kernel-source package post-installation script subprocess returned error exit status 6 Errors were encountered while processing: bcmwl-kernel-source E: Sub-process /usr/bin/dpkg returned an error code (1)

     – Sara Shokry Apr 05 '19 at 18:50
  • Did you find your Broadcom model ID in the list in the link in my answer? And it did not work with the driver suggested? – sudodus Apr 05 '19 at 18:55
  • I can't sudo apt upgrade to move on – Sara Shokry Apr 05 '19 at 19:09
  • Now I searched and solved the problem for sound and upgrading the system. But I couldn't know the right package to instal as my PCI.ID is [14e4:4727] (rev 01) and I'm using Ubuntu 18.04, It's special case #1 but I don't know what should I do? – Sara Shokry Apr 05 '19 at 19:44
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    I found an answer with repetition 3 and it worked for me. Thanks. – Sara Shokry Apr 05 '19 at 20:06
  • Congratulations @SaraShokry :-) Please edit your original question to describe your solution. It can be useful for other people. – sudodus Apr 06 '19 at 06:17