Enroll a new Machine-Owner Key? Yes/No. When upgrading from Ubuntu 16.04 LTS. What to choose?

Question

Dell

When updating a (normal) DELL Vostro 15 3000 series laptop, with Linux Ubuntu 16.04 LTS preinstalled, a question arose:

┌───────────────────────┤ Configuring Secure Boot ├────────────────────────┐
  │ A new Machine-Owner key has been generated for this system to use when   │
  │ signing third-party drivers. This key now needs to be enrolled in your   │
  │ firmware, which will be done at the next reboot.                         │
  │                                                                          │
  │ If Secure Boot validation was previously disabled on your system,        │
  │ validation will also be re-enabled as part of this key enrollment        │
  │ process.                                                                 │
  │                                                                          │
  │ Enroll a new Machine-Owner Key?                                          │
  │                                                                          │
  │                    <Yes>                       <No>                      │
  │                                                                          │
  └──────────────────────────────────────────────────────────────────────────┘

"No" is highlighted by default, what to choose, tell me? I encountered this for the first time ..
And how will this all affect the subsequent update to 18.04 LTS? Will there be any problems with the update and work?

Answer 1

This is a UEFI feature for using only signed drivers, security, all things.
Writes that the new system - a new key.
So click where is selected by default.