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On 23/07/2020 21:50, Mark Smith wrote: > 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 -- Kind regards, *Mark Smith* juglugs.com <https://juglugs.com> PGP fingerprint: FE57 FF27 C090 186C BFDE EF8B 9502 6421 F69F 0742 Update: I'm back online by just booting into an old kernel, 5.4.0-41 (5.4.0-40 works also), so something is borked in 5.4.0-42... More data collected: uname -a Linux marks-linux-box 5.4.0-42-generic #46-Ubuntu SMP Fri Jul 10 00:24:02 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux dpkg -l linux-* | grep ii ii linux-base 4.5ubuntu3.1 all Linux image base package ii linux-firmware 1.187.2 all Firmware for Linux kernel drivers ii linux-headers-5.4.0-40 5.4.0-40.44 all Header files related to Linux kernel version 5.4.0 ii linux-headers-5.4.0-40-generic 5.4.0-40.44 amd64 Linux kernel headers for version 5.4.0 on 64 bit x86 SMP ii linux-headers-5.4.0-41 5.4.0-41.45 all Header files related to Linux kernel version 5.4.0 ii linux-headers-5.4.0-41-generic 5.4.0-41.45 amd64 Linux kernel headers for version 5.4.0 on 64 bit x86 SMP ii linux-headers-5.4.0-42 5.4.0-42.46 all Header files related to Linux kernel version 5.4.0 ii linux-headers-5.4.0-42-generic 5.4.0-42.46 amd64 Linux kernel headers for version 5.4.0 on 64 bit x86 SMP ii linux-image-5.4.0-40-generic 5.4.0-40.44 amd64 Signed kernel image generic ii linux-image-5.4.0-41-generic 5.4.0-41.45 amd64 Signed kernel image generic ii linux-image-unsigned-5.4.0-42-generic 5.4.0-42.46 amd64 Linux kernel image for version 5.4.0 on 64 bit x86 SMP ii linux-libc-dev:amd64 5.4.0-42.46 amd64 Linux Kernel Headers for development ii linux-modules-5.4.0-40-generic 5.4.0-40.44 amd64 Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP ii linux-modules-5.4.0-41-generic 5.4.0-41.45 amd64 Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP ii linux-modules-5.4.0-42-generic 5.4.0-42.46 amd64 Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP ii linux-modules-extra-5.4.0-40-generic 5.4.0-40.44 amd64 Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP ii linux-modules-extra-5.4.0-41-generic 5.4.0-41.45 amd64 Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP ii linux-modules-nvidia-390-5.4.0-40-generic 5.4.0-40.44 amd64 Linux kernel nvidia modules for version 5.4.0-40 ii linux-modules-nvidia-390-5.4.0-41-generic 5.4.0-41.45 amd64 Linux kernel nvidia modules for version 5.4.0-41 ii linux-modules-nvidia-390-5.4.0-42-generic 5.4.0-42.46 amd64 Linux kernel nvidia modules for version 5.4.0-42 ii linux-modules-nvidia-390-generic-hwe-20.04 5.4.0-42.46 amd64 Extra drivers for nvidia-390 for generic-hwe-20.04 ii linux-sound-base 1.0.25+dfsg-0ubuntu5 all base package for ALSA and OSS sound systems
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