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

[Ralf Mardorf]

On Thu, 28 Jan 2021 16:52:18 +0100, Liam Proven wrote:
>On Wed, 27 Jan 2021 at 10:20, Bo Berglund <bo.berglund at gmail.com>
>wrote:
>
>>
>> So how can I handle the rename of the network and still not destroy
>> whatever the existing entry is meant to do?  
>
>You just add the commands onto the end.
>
>The kernel takes parameters, just like most Linux (and Windows)
>commands take parameters.
>
>For instance, the parameter "nomodeset" tells the kernel not to change
>the graphics mode of the console -- in other words to leave it in
>whatever mode it starts up.
>
>Compare: "ls -la" -- surely a command you use a lot. Most of us do.
>
>The command "ls" takes a switch following a minus sign. Here you pass
>2 after the minus sign: "l" for "long" and "a" for "all". LiSt All
>files in Long format.
>
>Let's say you only wanted files beginning with a Q. You'd type:
>
>ls -la q*
>
>... or...
>
>ls q* -la
>
>Doesn't matter.

It depends. IIRC years ago FreeBSD by default allowed only "ls -la
q*", while "ls q* -la" didn't work. Btw. most of my linux default to
"lsd", while the order doesn't matter, usage of options is sometimes
tricky, "-hAld" can't be used ;). It's reasonable, but annoying.

Not all implementations of "ls" work in the same way.

>This is the same.
>
>You can edit the menu entry in GRUB to try this out if you're not
>sure. Highlight the Ubuntu line in your GRUB menu and press E for
>Edit.
>
>It shows you the commands GRUB uses to boot Linux. One line is the
>kernel. Cursor down to that, add the new parameters on the end, and
>press F10 to go.
>
>If it works as you wish, make it permanent by adding them to
>/etc/default/grub
>
>This is a config file. It does not boot the computer; it's a set of
>instructions on how to write the config file for GRUB. So the
>parameters go in quotes. Put yours in the same quotes separated by a
>space. Before, after, doesn't matter. Just not in the middle of the
>existing ones.

IIUC the OP is concerned about the quotes.

Btw.

cat /proc/cmdline

shows the currently used parameters.