Option to change login screen color missing

[Nav]

This is for Ubuntu 20.04 LTS. Not everyone likes the pink/purple colors of Ubuntu. We'd prefer to change it to grey/blue shades. But those options do not appear to be available now, as mentioned here: https://askubuntu.com/questions/1227070/how-do-i-change-login-screen-theme-or-background-in-ubuntu-20-04

Apart from login screen, there are a lot of other settings which need to be provided via the default GUI settings in Ubuntu, instead of expecting us to open up the /etc/default/grub file or installing gnome-tweaks. Some of these are:
1. The Ubuntu login screen color.
2. Grub timeout countdown and grub menu options order.
3. Ubuntu splash screen switched off during startup and shutdown.
4. Ubuntu firewall (ufw) being pre-installed and active.
5. GUI close button, maximise and minimize buttons being on the left side instead of right.

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1942245/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[Paul White (paulw2u)]

Thank you for your suggestions. However, the changes you are requesting aren't really a bug and require more discussion, which should be done on an appropriate mailing list or forum.

http://www.ubuntu.com/support/community/mailinglists might be a good start for determining which mailing list to use. Posting on https://discourse.ubuntu.com/ will also attract the attention of the Desktop Team developers who might consider your suggestions or give their reasons why they cannot or will not be considered.

However, please be aware that suggestions 1 and 3 might go against Ubuntu policy and that suggestion 5 has long been available by installing the "Tweaks" application and changing the default option under "Window Titlebars".

[Nav (navipe)]

Thank you Paul. I've mentioned it in Discourse https://discourse.ubuntu.com/t/changing-the-grub-splash-and-gdm-lock-screen-color/7516/15?u=navnav