Lost sound and internet suddenly

[tea for one]

Do you want to remove the troublesome kernels or change grub to persistently boot a different kernel?

[Autodave]

Either way, I guess. It is just a pain to have to choose a kernel every time. I do switch to Win10 a few times a day for a game. Switching back to Xubuntu becomes a real pain then. I suppose that when they get a kernel to work that I will want to use the new kernel, but right now none of the 5.8 kernels work for me.

[tea for one]

This is the method I used 18 months ago when a kernel upgrade caused a very slow (2 minutes) boot process.

Back up your existing grub and change the default kernel as follows:-

sudo nano /etc/default/grub

Find this line:-

GRUB_DEFAULT=0

Change to (for example):-

GRUB_DEFAULT=“1>2”

Save the file, exit and then:-

sudo update-grub

Grub default is usually 0
The 1 in blue is Advanced Options in 1st grub menu
The 2 in red is the is 2nd kernel in list

If you need the third kernel in the list then enter 3
If you need the third kernel in the list then enter 4 etc etc.

Previously, I left the troublesome kernels in place so that, when a repaired kernel became available, the auto update kicked in and I could check that it worked OK.

[Autodave]

I am so sorry for making you type all of that. I should have told you that I have Xubuntu on a separate SSD from Win10. I choose which SSD to boot from when I power the machine on or restart it by hitting F11 and then choosing an SSD.

[tea for one]

That's OK - You can still adjust the grub in your Xubuntu SSD to automatically select a working kernel.

I always isolate, de-activate or remove other drives (i.e. your Windows 10 drive) to avoid any unforeseen alteration to the other operating systems if changing grub.

I've always preferred each OS on a separate drive because it is easy to boot from the UEFI boot screen.