network missing

[Jeffrey Walton]

On Sat, Mar 30, 2024 at 7:51 AM Grizzlly via ubuntu-users
<ubuntu-users at lists.ubuntu.com> wrote:
>
> Saturday, March 30, 2024  at 12:22, Nils Kassube via ubuntu-users wrote:
> Re: network missing (at least in part)
>
> >On 29.03.24 Grizzlly via ubuntu-users wrote:
> >> Updated Nobal Unity,
> >> on completion file manager went missing,
> >> reboot, network missing
> >>
> >> lshw -c network, *-network DISABLED
>
> >You could try what happens if you reboot and select an older kernel version
> >from the grub menu. That should at least bring back the network. If you get
> >your network back with the older kernel, you'd better remove the latest
> >kernel.
>
> >I had problems with the 6.8.0-20-generic kernel on one machine, it would no
> >longer boot so I had to remove it.
>
> I got as far as 6.8.0-11-generic (maybe 6.8.0-20-generic came in the days since
> I had a network) I did try going back to 6.6.0-14-generic, but had same
> problem, I "assume" 6.8.0-11-generic removed some files (networkmanager etc)
>
> >Another option would be to boot from a noble USB stick and then try repair
> >the system on disk. But that's a bit more tricky.
>
> at moment I'm trudging thru getting networkmanager.deb installing (fails) it
> and then getting (trying) the dependances

As a temporary measure until you get your networking manager working:

    # Find interfaces
    $ ls /sys/class/net/
    enp0s20f0u3c2  lo

Then run:

    # Bring the interface up
    $ ifup enp0s20f0u3c2

If that fails:

    echo 'auto enp0s20f0u3c2' >
/etc/network/interfaces.d/enp0s20f0u3c2.interface
    echo 'allow-hotplug enp0s20f0u3c2' >>
/etc/network/interfaces.d/enp0s20f0u3c2.interface
    echo 'iface enp0s20f0u3c2 inet dhcp' >>
/etc/network/interfaces.d/enp0s20f0u3c2.interface

Then reboot.

In the past I had luck with creating enp0s20f0u3c2.interface after a
tasksel removed GNOME and its network manager. But this was on Debian,
not Ubuntu.

Jeff