How to get eth0 and wlan0 back on Ubuntu Mate 18.04?

[Tom H]

On Wed, Jan 27, 2021 at 10:20 AM Bo Berglund <bo.berglund at gmail.com>
wrote:
>
> I have a repurposed laptop running Ubuntu Mate 18.04.5 LTS and I
> need to run a lot of scripts on this, but they fail because for
> some reason eth0 and wlan0 are no longer available...
>
> How can I re-enable the use of these standard names instead of the
> new strange names?
>
> I have searched the net and found some instructions here:
> https://www.itzgeek.com/how-tos/mini-howtos/change-default-network-name-ens33-to-old-eth0-on-ubuntu-16-04.html
>
> But the first part of this instruction is not clear since it says
> to "add" to /etc/default/grub like this:
>
>
> Look for “GRUB_CMDLINE_LINUX”  and add the following”net.ifnames=0
> biosdevname=0“.
>
> From:
> GRUB_CMDLINE_LINUX=""
> To:
> GRUB_CMDLINE_LINUX="net.ifnames=0 biosdevname=0"
>
>
> However, my existing entry is not empty, instead it has this:
> GRUB_CMDLINE_LINUX="resume=UUID=<long guid string>"
>
> So how can I handle the rename of the network and still not destroy whatever the
> existing entry is meant to do?

GRUB_CMDLINE_LINUX="resume=UUID=<long guid string> net.ifnames=0 biosdevname=0"