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A few days ago I updated my UBUNTU 16.04 version with 18.04.1

But after that, my wifi stopped working on my laptop. I'm using Acer E515 laptop and my wireless card manufacturer is Qualcomm.

I also tried with lots of solution links on stack-overflow, askubuntu, and other youtube videos but nothing is working for me.

Lots of videos and links are saying go to your 'Software Update' and click on 'Additional Drivers' Tab and proceed.

But in my case 'Additional Drivers' tab is showing 'No additional drivers available'.

Yesterday, I was tried with this link: https://ubuntuforums.org/showthread.php?t=2392454

But on the last step, it's giving an error (this package is deleted something like this) related to 'linux-header-kernel' 4.0.3-generic something.

when i run 'uname -r' command then it's showing :- 'linux-header-kernel-4.0.3-generic' something.(I don't know what was actually)

Please help me guys, I can't make a full-day Ethernet or Cable connection to my laptop.

Thanks

ThunderBird
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Rajesh kumar
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    It is not useful to attempt to install Realtek drivers for your Atheros card. Please provide full diagnostics from here: https://askubuntu.com/questions/425155/my-wireless-wifi-connection-does-not-work-what-information-is-needed-to-diagnos/425180#425180 Welcome to Ask Ubuntu. – chili555 Oct 04 '18 at 14:08
  • What should i share with you? @chili555 – Rajesh kumar Oct 04 '18 at 14:42
  • kernel

    Linux 4.4.0-31-generic

    lspci

    02:00.0 Network controller [0280]: Qualcomm Atheros QCA9377 802.11ac Wireless Network Adapter [168c:0042] (rev 31) Subsystem: Lite-On Communications Inc QCA9377 802.11ac Wireless Network Adapter [11ad:08a6] Kernel driver in use: ath10k_pci 03:00.1 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 12) Subsystem: Acer Incorporated [ALI] RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [1025:1094] Kernel driver in use: r8169

     – Rajesh kumar Oct 04 '18 at 14:47
  • Please download the script in the link I provided, run it and paste the result: http://paste.ubuntu.com and give us the link. – chili555 Oct 04 '18 at 14:53
  • Please check @chili555 https://paste.ubuntu.com/p/C6Sc6P4d3p/ – Rajesh kumar Oct 04 '18 at 15:08
  • How is it that you are running kernel version 4.4-xx and Ubuntu 18.04? The usual kernel for 18.04 is 4.15-xx. Have you updated since installation? What does this tell us? ls /boot – chili555 Oct 04 '18 at 16:57
  • Before 3 days ago, I updated it 16.04 to 18.04 – Rajesh kumar Oct 04 '18 at 17:00
  • How can I fix it without losing my data, please help me – Rajesh kumar Oct 04 '18 at 17:01
  • Let us continue this discussion in chat. – chili555 Oct 04 '18 at 17:02

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