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Short version: I downloaded Ubuntu from my Windows PC, made a bootable usb stick and installed it on an Acer Aspire laptop (which had windows before). Now my WIFI does not work and I am completely lost as I need to download everything via Windows PC (But what do I need in this case? As I understand too little I would need to start with random solution like try another Ubuntu version, ...).

Some details after research on the web:

ethtool => not found
ifconfig => not found
lsb_core => not found
iwlist scan
lo       Interface does not support scanning
enp1s0f1 Interface does not support scanning
iwconfig
lo       no wireless extension
enp1s0f1 no wireless extension

I use a "normal installation" and "installed third-party software".

From lshw:
Ethernet interface
RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
Realtek
Name enp1s0f1

As said: I am new to Ubuntu and more information can be shared if I know for what I must look... Any help is highly appreciated!

lspci -nnk | grep 0280 -A3
02:00.0 Network controller [0280]: Broadcom Limited BCM43142 802.11b/g/n [14e4:4365] (rev 01)
        Subsystem: Foxconn International, Inc. BCM43142 802.11b/g/n [105b:07e]
        Kernel modules: wl

lspci -knn | grep Net -A3; rfkill list
0: acer-wireless: Wireless LAN
        Soft blocked: no
        Hard blocked: no
1: acer-bluetooth: Bluetooth
        Soft blocked: no
        Hard blocked: no
2: hci0: Bluetooth
        Soft blocked: no
        Hard blocked: no

Work in progress:

sudo apt install bcmwl-kernel-source
Paketlisten werden gelesen... Fertig
Abhängigkeitsbaum wird aufgebaut.       
Statusinformationen werden eingelesen.... Fertig
bcmwl-kernel-source ist schon die neueste Version (6.30.223.271+bdcom-0ubuntu4).
0 aktualisiert, 0 neu installiert, 0 zu entfernen und 319 nicht aktualisiert.
Christoph
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    Let's try to identify your wireless hardware. Please edit your question to add the result of the terminal command: lspci -nnk | grep 0280 -A3 Welcome to Ask Ubuntu. – chili555 Nov 10 '18 at 14:29
  • @chili555 See my edit... – Christoph Nov 10 '18 at 19:22
  • Please also show: sudo modprobe wl && dmesg | grep wl – chili555 Nov 10 '18 at 19:37
  • @chili555 It seems modprobe does not have an wl arg: modprobe: ERROR: could not insert ´wl´: Required key not available. I also checked here – Christoph Nov 10 '18 at 19:43
  • Disable secure boot and you should be all set. – chili555 Nov 10 '18 at 21:04
  • @chili555 Boot Mode is set to UEFI and it seems, I can´t change secure boot [enabled]. Do I have to change Boot mode to Legacy? – Christoph Nov 10 '18 at 21:33
  • I would first try the mokutil method discussed at the duplicate. – chili555 Nov 10 '18 at 21:57
  • @chili555 I tried sudo mokutil --disable-validation and rebooted - even a shutdown + start. But I was not asked for anything afterwards. How can I check if things really changed? modprobe still gives the key not available error. – Christoph Nov 11 '18 at 19:55
  • If that doesn't work, then set the BIOS to legacy mode and try modprobe again. – chili555 Nov 12 '18 at 02:36
  • @chili555: The question is not really a duplicate. 1) You need an Ethernet connection - the ISO-image is not enough. (Is that clear?) 2) Then do the steps described in your suggetion. 3) Reinstall drivers LAST as discribed here. It took some time to get this working - I also tried another order 1-3 which did not work(!?). If you like, you can post this as answer - explanations are welcome. I would like to understand what I am doing ;-) – Christoph Jan 05 '19 at 14:02
  • I am having difficulty understanding the process you followed. Please write an answer and describe it in detail and then we may discuss it; perhaps in chat. – chili555 Jan 06 '19 at 16:28
  • @chili555 I think i can't add an answer when the question is marked as duplicate. – Christoph Jan 06 '19 at 16:32
  • Please describe your answer in detail here and give me the link: http://paste.ubuntu.com – chili555 Jan 06 '19 at 17:07

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