Wireless USB adapter not working since last update (july 2020)

[Moltke]

I wonder now, is it safe for me not to update my kernel from now on?

Updating/Upgrading the kernel is not mandatory, certainly not necessary in older machines/systems since it could lead to issues like system's  instability. So yes, as long as your machine works fine you can keep on using the same kernel version for as long as you want/need. If you do not want it to update with the system, open a terminal and type

Code:

sudo apt-mark hold your_kernel_version_here

type in your password when asked and hit enter. To check that it worked type

Code:

apt-mark showhold

and it should show the kernel. From there on your kernel won't be updated along with the system.

Hope this helps!