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Super newbie here. I just installed Ubuntu on my laptop. Can someone tell me how can i setup a network connection? Thanks.

The results from lspci -knn | grep Net -A2 are: 

03:00.0 Network controller [0280]: Broadcom Limited BCM43142 802.11b/g/n [1434:465] (rev1)
Subsytem: Lenovo BCM43142 802.11b/g/n
04:00.0 Display controller [0380]: Advcanced Micro Devices, Inc. [AMD/ATI] 
  Sun XT [Radeon HD 8670A/8670M/8690M / R5 M330 / M430] (rev ff)
Thomas
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Alex Dani
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  • Searching for "Lenovo G50-80 ubuntu wifi" found a few possible similar Q's on this site, try their answers and then reply saying which one worked (if any): https://askubuntu.com/questions/681828/lenovo-g50-80-ubuntu-14-04-wifi-not-working [the next answer requires an internet connection to install a package, or a usb to d/l and install manually] https://askubuntu.com/questions/1007669/wifi-doesnt-work-on-my-lenovo-g50-80ubuntu-17-10-1 – Xen2050 Mar 24 '18 at 10:37

2 Answers2

1

Wired connection problems

Your ISP must have things set up so you have to go through the router to get an internet connection, so leave the router connected to the main "incoming" wire and use another wire from one of the router's lan ports to your laptop.

Now that you've got a network connection, you can try using a package manager (like Ubuntu's Software Center, or Synaptic, or plain apt / apt-get) and try to fix:

Wireless connection problems

  1. apt-get update
  2. apt-get install bcmwl-kernel-source
  3. reboot (I hate rebooting linux, there might be a combination of rmmod and modprobe or restarting services that could avoid a reboot, but I don't know it)

Adding a few lines like
blacklist b43
blacklist bcma
blacklist ssb
to /etc/modprobe.d/blacklist.conf may or may not be required, try without first see the first link below for more info.

If it works, then you should see the desktop's GUI wifi icon in the panel / menu bar and see & connect to wireless networks, similar to this:

Wifi icon menu

More info:

Xen2050
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  • Finaly solved it with the help of this link your provided: https://askubuntu.com/questions/55868/installing-broadcom-wireless-drivers. After is install the driver i had to turn off SECURE BOOT(It was already turned off but after i toggled problem was solved :) thanks for the help – Alex Dani Mar 24 '18 at 14:29
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Towards the top right side of your screen, there should be a weird cog looking thing, the time, a speaker icon, battery, and last should be two arrows pointing up and down in opposite directions. Click on the arrows and it should give you an option of network connection options.

If this does not work, try navigation to the top left and left click Activities. In the search bar, type in Network and select Network. There should be more options for networks and connection types.

BobserLuck
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  • I only have the speaker, battery and a submenu arrow thing with some other info(sound, luminosity, vpn. battery power settings, account settings) – Alex Dani Mar 24 '18 at 07:33
  • @AlexDani Alright, then try going to the top left corner and click on Activities. Then type in Network. Click on Network and it should give you more network connection options. – BobserLuck Mar 24 '18 at 07:43
  • The network panel shows Wired(which is unplugged right now), Vpn not set up, network proxy automatic. I connected the laptop to the ethernet cable and wired showed me a connection but still i was unable to access mozzila pages(Server not found). Also Wi-Fi panel shows(No wi-fi adapter found). I looked up the forum and someone suggested sudo apt-get update but i get errors with dns server and fails to fetch. – Alex Dani Mar 24 '18 at 08:01
  • @AlexDani lol, yeah. apt-get requires an internet connection so that won't help at the moment. Try restarting network manager by opening a terminal. Go back to activities and search for terminal. Once opened, type sudo service network-manager restart. It will ask for your password but it should restart your network manager and give it a kick in the pants. After doing that, try connecting with Ethernet again and running sudo apt-get update && sudo apt-get upgrade to make sure to get new updates that could help. If that doesn't work then let me know, there are other options – BobserLuck Mar 24 '18 at 08:52
  • I typed sudo service network-manager restart introduced password then nothing showed in terminal(guessed it worked? I don't know). Plugged the ethernet cable and still when i type sudo apt-get update 4 errors return(DNS problems with archive.ubuntu.com) – Alex Dani Mar 24 '18 at 09:07
  • Using an ethernet cable should definitely have worked, does your router work with the same wire with other devices? And search the web for your laptop model with wireless or wifi, you might need to do something special to get it recognized – Xen2050 Mar 24 '18 at 09:29
  • @Xen2050 I have 1 ethernet cable plugged in router. When i plug the cable in laptop i get an wired connection, but when i access a firefox page i get "Server not found". Model of laptop is Lenovo G50-80. I have not found anything that I understand and might solve my problem. – Alex Dani Mar 24 '18 at 09:52
  • @AlexDani Alright, here is a link with a similar problem and a few different things to try https://askubuntu.com/questions/488139/installed-ubuntu-14-04-cannot-connect-to-internet-with-wired-or-wireless-conne – BobserLuck Mar 24 '18 at 10:02
  • It's either wifi-menu, wpa-supplicant, or wicd-curses, but more than likely it's wpa. https://wiki.archlinux.org/index.php/WPA_supplicant nmcli and conman are usually installed by the user after the install –  Mar 24 '18 at 10:08
  • You may also want to put your wireless interface up with ip link set wlan0 up; ifconfig –  Mar 24 '18 at 10:19
  • You mean you're unplugging the main "internet" cable from your router, and plugging it into your laptop? Does that work to connect any other laptops? Your ISP might have things set up so you have to go through the router to get an internet connection, try leaving the router connected and use another wire from one of the router's lan ports to your laptop. – Xen2050 Mar 24 '18 at 10:30
  • @Xen2050 Wow i feel so dumb. Yep i connected the cable from router's lan ports to laptop and now i have internet connection. Still wifi adapter is not found. Any more ideas on that? Also thanks all for the answers. – Alex Dani Mar 24 '18 at 11:27
  • Some ISP's are weird, don't want you using your own router or something. At least now you can try installing things... I might as well post my comments as an answer, got 1/2 the problem solved at least – Xen2050 Mar 24 '18 at 11:34
  • Maybe you should try the cinnamon flavor lol its more like windows –  Mar 24 '18 at 12:29