No WiFi After Updates – Reinstall doesn't Fix (Ubuntu 18.04)

No WiFi After Updates – Reinstall doesn't Fix (Ubuntu 18.04)


I installed Ubuntu 18.04 on an HP-Stream-Laptop-11 about a year ago (single boot). Working great until the latest update.

Immediately after update restart there was no wifi access. I could find no cause for problem so reinstalled 18.04 (from same live USB as first installation). But, after several reinstall attempts, still no wifi!

Interestingly, Wifi works great when machine is booted from the live USB, and works during the install. Then, after restart… no wifi!

My first idea was that it had something to do with “MOK generation and signing,” which I don’t really understand, but think that I followed the procedure correctly as stated here. (I don’t remember how the MOK step went on the install a year ago. There were no MOK notices after the recent update.)

Any help greatly appreciated. The laptop has no ethernet capability, only wifi (when working!). I would like to keep secure boot rather than going legacy — in case that seems like the issue.

If it helps, “sudo lshw -c network” returns the following:


[email protected]:~$ sudo lshw -c network
  *-network DISABLED       
      description: Wireless interface
      product: Realtek Semiconductor Co., Ltd.
      vendor: Realtek Semiconductor Co., Ltd.
      physical id: 0
      bus info: [email protected]:01:00.0
      logical name: wlo1
      version: 00
      serial: 40:5b:d8:44:42:0b
      width: 64 bits
      clock: 33MHz
      capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
      configuration: broadcast=yes driver=rtw_pci driverversion=5.4.0-42-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11
      resources: irq:124 ioport:1000(size=256) memory:91100000-9110ffff

“sudo lspci -nnk | grep 0280 -A3” returns:


[email protected]:~$ sudo lspci -nnk | grep 0280 -A3
01:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. Device [10ec:c822]
    Subsystem: Hewlett-Packard Company Device [103c:85f7]
    Kernel driver in use: rtw_pci
    Kernel modules: rtwpci

“rfkill list all” returns:


  [email protected]:~$ rfkill list all
  1: phy0: Wireless LAN
      Soft blocked: yes
      Hard blocked: no
  3: hci0: Bluetooth
      Soft blocked: no
      Hard blocked: no

WiFi worked great until the recent update. Still works fine if running Ubuntu from live USB. Any help greatly appreciated. (Really wanting to do this without going to legacy mode.)

Thanks much.


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