[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: pci@0000:02:00.0 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: pci@0000:03:00.0 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.

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