Recently I tried to install open nebula and for some reason,the eno1 network interface disappeared from my Ubuntu 20.04 network configuration and I would like to restore it, because now I'm not able to connect to internet. Ubuntu 20.04 uses netplan. This is my 01-network-manager-all.yaml
file:
network:
version: 2
renderer: networkd
ethernets:
eno1:
dhcp4: true
When I do ifconfig
, I see these network interfaces:
docker0 : inet 172.17.0.1 ; netmask 255.255.0.0 ; broadcast 172.17.255.255
minione-nic : no inet ; no netmask ; no broadcast
veth03ad024 : no inet ; no netmask ; no broadcast
virbr0 : inet 192.168.122.1 ; netmask 255.255.255.0 ; broadcast 192.168.122.255
virbr0-nic : no inet ; no netmask ; no broadcast ;
I tried to re-create the old eno1 interface with these commands:
sudo netman apply
sudo systemctl restart network-manager
I don't see any identation error, but the situation is not changed. I have no eno1 interface and no connection to internet. What should I do? what's missing?
NB : this is what happened after having followed the @heynnema's original suggestion:
root@ziomario-I5:/etc/netplan# sudo netplan --debug generate
DEBUG:command generate: running ['/lib/netplan/generate']
** (generate:3712): DEBUG: 22:35:25.392: Processing input file
/etc/netplan/01-network-manager-all.yaml..
** (generate:3712): DEBUG: 22:35:25.392: starting new processing pass
** (generate:3712): DEBUG: 22:35:25.393: We have some netdefs, pass them
through a final round of validation
** (generate:3712): DEBUG: 22:35:25.393: eno1: setting default backend to
2
** (generate:3712): DEBUG: 22:35:25.393: Configuration is valid
** (generate:3712): DEBUG: 22:35:25.393: Generating output files..
** (generate:3712): DEBUG: 22:35:25.393: networkd: definition eno1 is not
for us (backend 2)
(generate:3712): GLib-DEBUG: 22:35:25.393: posix_spawn avoided (fd close
requested)
This is the netplan file that I used (01-network-manager-all.yaml) :
# Let NetworkManager manage all devices on this system
network:
version: 2
renderer: NetworkManager
ethernets:
eno1:
dhcp4: true
I have also tried this version:
# Let NetworkManager manage all devices on this system
network:
version: 2
renderer: NetworkManager
I tried also:
# Let NetworkManager manage all devices on this system
network:
version: 2
renderer: networkd
ethernets:
eno1:
dhcp4: true
it says: NetworkManager : definition eno1 is not for us (backend 1
)
no eno1 interface has been produced. so it does not work.
root@ziomario-I5:/etc/netplan# sudo lshw -C network
*-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: 06
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list
configuration: latency=0
resources: ioport:d000(size=256) memory:d3804000-d3804fff memory:d3800000-d3803fff
*-network:0
description: Ethernet interface
physical id: 2
logical name: veth91a709d
serial: 96:ae:1d:67:88:d8
size: 10Gbit/s
capabilities: ethernet physical
configuration: autonegotiation=off broadcast=yes driver=veth driverversion=1.0 duplex=full link=yes multicast=yes port=twisted pair speed=10Gbit/s
*-network:1
description: Ethernet interface
physical id: 3
logical name: docker0
serial: 02:42:22:9d:a2:14
capabilities: ethernet physical
configuration: broadcast=yes driver=bridge driverversion=2.3 firmware=N/A ip=172.17.0.1 link=yes multicast=yes
*-network:2
description: Ethernet interface
physical id: 4
logical name: virbr0
serial: 52:54:00:6b:98:0e
capabilities: ethernet physical
configuration: broadcast=yes driver=bridge driverversion=2.3 firmware=N/A ip=192.168.122.1 link=no multicast=yes
*-network:3 DISABLED
description: Ethernet interface
physical id: 5
logical name: virbr0-nic
serial: 52:54:00:6b:98:0e
size: 10Mbit/s
capabilities: ethernet physical
configuration: autonegotiation=off broadcast=yes driver=tun driverversion=1.6 duplex=full link=no multicast=yes port=twisted pair speed=10Mbit/s
my /etc/network/interfaces file looks like this…
interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
dkms status
:
bbswitch 0.8 ; 5.4.0-40-generic, x86_64 : installed
bbswitch 0.8 ; 5.4.0-41-generic, x86_64 : installed
bbswitch 0.8 ; 5.4.0-42-generic, x86_64 : installed
virtualbox,6.1.10, 5.4.0-40-generic, x86_64 : installed
virtualbox,6.1.10, 5.4.0-41-generic, x86_64 : installed
virtualbox,6.1.10, 5.4.0-42-generic, x86_64 : installed
Partial solution : RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller does not work with kernel 5.4.0-42-generic ; it says that the device is unclaimed. Instead,with the kernel 5.4.0-41-generic it worked perfectly. so this is a bug of that kernel version.
Best Answer
Edit your
/etc/netplan/01-network-manager-all.yaml
to this. Keep the spacing, indentation, and no tabs, exactly as I show it.For server or systemd-networkd:For desktop and NetworkManager:
sudo netplan --debug generate
sudo netplan apply
reboot
Update #1:
I've loaded Ubuntu Live and I saw the eth0 interface and it worked.
Update #2:
RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller does not work with kernel 5.4.0-42-generic ; it says that the device is unclaimed. Instead, with the kernel 5.4.0-41-generic it worked perfectly. so this is a bug of that kernel version.
Update #3:
Installed the
r8168-dkms
driver, and it works with kernel 5.4.0-42-generic.Note that the -41 kernel, and the broken -42 kernel, came from enabling the
Proposed
repository. I'd recommend disabling that repo.