[ubuntu] How do I get my Network (and settings) back in 20.04?

[ubuntu] How do I get my Network (and settings) back in 20.04?

 
I have lost my network connections (Ethernet, WiFi and Bluetooth) on Ubuntu 20.04. I don’t know what I did to lose them, but after a reboot, they had gone. There is no network icon in the system tray and in settings, there is no setting for WiFi and no connections in the network submenu.

I can boot from a Live USB image and everything works well.

So, from another answer I found, I backed up, then copied the netplanner, and NetworkManager files and directories from the Live USB to my computer. Rebooted into the “normal” Ubuntu environment and still nothing.

I ran sudo

Code:

lshw -C network


and the output is:

Code:

*-network UNCLAIMED     
      description: Network controller
      product: AR9485 Wireless Network Adapter
      vendor: Qualcomm Atheros
      physical id: 0
      bus info: [email protected]:02:00.0
      version: 01
      width: 64 bits
      clock: 33MHz
      capabilities: pm msi pciexpress cap_list
      configuration: latency=0
      resources: memory:f7100000-f717ffff memory:f7180000-f718ffff
  *-network UNCLAIMED
      description: Ethernet controller
      product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
      vendor: Realtek Semiconductor Co., Ltd.
      physical id: 0
      bus info: [email protected]:03:00.0
      version: 07
      width: 64 bits
      clock: 33MHz
      capabilities: pm msi pciexpress msix vpd bus_master cap_list
      configuration: latency=0
      resources: ioport:d000(size=256) memory:f2104000-f2104fff memory:f2100000-f2103fff


My NetworkManager.conf file is:

Code:

[main]
plugins=ifupdown,keyfile

[ifupdown]
managed=false

[device]
wifi.scan-rand-mac-address=no


and my 01-network-manager-all.yaml file is:

Code:

# Let NetworkManager manage all devices on this system
network:
  version: 2
  renderer: NetworkManager
Using sudo nmcli gives:
lo: unmanaged
        "lo"
        loopback (unknown), 00:00:00:00:00:00, sw, mtu 65536

Use "nmcli device show" to get complete information about known devices and
"nmcli connection show" to get an overview on active connection profiles.

Consult nmcli(1) and nmcli-examples(7) manual pages for complete usage details.


I don’t have ifconfig (net-tools) installed.

Running

Code:

nm-applet


brings up a greyed out system tray icon, but when I click that, the window that opens (showing the connections) is empty.

Any help is greatly appreciated.

 

Previous [ubuntu] 20.04 - Chromium snap extremely slow to start
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