Feature request: Selecting autologin at install time should also disable lock in screensaver

[IlarioGelmetti]

Originally reported here: https://answers.launchpad.net/ubuntu/+source/ubiquity/+question/694975

What I did:
I just installed Ubuntu 20.04.1 and selected the Autologin option during the installation process.

What I expected:
I expected to need the password exclusively for administrative operations.

What I got instead:
Instead, once the screensaver went up the screen lock was present and the password was required.

Alternative solution:
To disable the locking is very easy in the Settings/Privacy/Screen lock, there's no problem with how to do it.

What I propose:
When the Autologin is selected in Ubiquity (during Ubuntu installation), Ubiquity should also switch off the screen lock in the screensaver options.

Discussion:

I see two cases:
1) the user selected the Autologin and did not encrypt the hard drive. Clearly the user considers that local security is not a risk in its environment and expects to not be asked the password often. The actual security provided by the screen lock is very limited as rebooting the machine is enough to access all the (saved) data. In this case Ubiquity should disable the screen lock in the screensaver options.
2) the user selected the Autologin and encrypted the hard drive. This is a perfectly meaningful choice (which I suppose is available, I did not try, but I don't think it is common?). In this case the screen lock in the screensaver options should be preserved and Ubiquity should be able to recognize this situation.