Hi
After (finally!) obtaining a dual boot, I have one more (for now) issue
Unable to rid the pesky password prompt
Tried several tutorials, searched LQ, to no avail

Password prompt for what, to log in? You can set autologin on most any Linux, whichever one you might be using. You shouldn't need a password unless you are doing administrative tasks such as installing new software or modifying system files.

Which distro? They all allow autologin but the specific details about the icon + menu to choose or which file to change vary slightly.

For example if your distro uses the lightdm display manager, then you would add something like the following line to its configuration file:

However, different distros use different display managers and even deal with the display manager configuration file slightly differently.

Ubuntu
practically everything!
autologin was set

Okay, you need to be FAR more specific. It is absolutely unclear what issue you are trying to describe, and there are different solutions for the different possible issues.

I was somewhat wrong
not everything
but
for example when I open GParted or GRUB Customizer
since they will be hardly used from now, then perhaps the problem is minor
still, will be nice to eliminate the prompt entirely

You can disable it for sudo (command line).... but that wont affect GUI stuff. What you're talking about, the password from GUI apps that need root (to write outside your home folder), is handled by policykit. Not sure how to disable that... (and dont think its a very good idea either... but still curious if its possible now that you came up with such a crazy idea).

I suggest just make a simple password, thats better than disabling completely I'd think... one or two letters...

hint: sudo passwd username
(if you dont use sudo ubuntu wont let you use simple passwords).

completely eliminating the usage of root password means every hacker can use your computer without any effort....

1 members found this post helpful.

ok
thanks

I hope you're exaggerating. I would imagine others shouldn't be able to even get a login prompt in the first place unless you opened things up for them.

someone removes root password, enables javascript, allows other important things, forget update....
Yes, you are right, I'm exaggerating

Alright.
Assuming that you're talking about SUDO verification prompts, I don't know how to ABSOLUTELY solve this.
The closest I'd get is disabling it in the CLI. You'd use the command sudo visudo (or run visudo while logged in as root), and uncomment the line under the first "same thing without a password" line. This makes Sudo automatically verify your user account for root-level terminal tasks. ​
Now, with visudo comes the VI/VIM editor, which is famously hard for newbies to figure out. Now, if you don't want to learn the default keybinds for VIM, you can use the far, Far, FAR riskier undertaking of editing the /etc/sudoers file. BE WARNED: this is pretty dangerous, and if you make an edit that you don't know how to reverse, you may well break your system. BE VERY CAREFUL!
However, this means almost nothing for GUI prompts (prompts for opening graphical apps with your desktop environment). for that, I don't really know what to do. The only thing that comes to mind is logging in as the highly privileged "Root" user account. DO NOT DO THIS. it is HIGHLY unrecommended, as it is foolish, and possibly dangerous to your system.
If none of this makes sense, here's a simple guide:
https://www.ubuntugeek.com/how-to-di...in-ubuntu.html
Happy to help :)