change loaded kernel how to ?

[BobMacall]

So, I went through a seemingly normal software update but now wifi doesn't work. One of the programs changed was the kernel.
I read elsewhere that update manager can be used to change this back but it doesn't seem possible on my Mint 17 system. When
I look at kernels from update manager -> view ->kernels it shows a loaded kernel (the new one) and another kernel (the old one) as installed.
But I don't seem to have the option to modify this. There is a remove button but it isn't active (greyed out) when I select the old kernel.
So, I want to make the old kernel as loaded. Does anyone have this figured out?
Thanks,
Bob

[Moem]

Choose a different kernel during boot. If you get a GRUB screen, that's easy because it shows a list of bootable kernels, and you'll understand how it works; if you don't, press and hold Shift during boot. That should get you to the GRUB screen.

[Pjotr]

As Moem says. Old kernels are to be found under the "Advanced" section in the Grub bootloader menu.

[BobMacall]

I got it to work. But, hitting shift or esc during grub menu didn't do anything, no advanced menu. But
I noticed that a previous versions entry showed up in the menu. I didn't notice that before. Selecting that
gave me the option to go back to the old kernel.
Thanks,
Bob

[michael louwe]

@ BobMacall , .......

...

.
You should also remove the problematic kernel.