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 lshw -C network and the output is:
*-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:
[main]
plugins=ifupdown,keyfile
[ifupdown]
managed=false
[device]
wifi.scan-rand-mac-address=no
and my 01-network-manager-all.yamlfile is:
# 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 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.
Mark
