to achieve the requirements in the Question for default Ubuntu 18.04
need to edit the below files:
- for changing grub color:
/usr/share/plymouth/themes/ubuntu-logo/ubuntu-logo.grub
- for plymouth color:
/usr/share/plymouth/themes/ubuntu-logo/ubuntu-logo.script
- for login-screen background color:
/usr/share/gnome-shell/theme/ubuntu.css
ubuntu-logo.grub my file content. replace the values to 0,0,0,0; for black
if background_color 66,48,228,0.5; then
clear
fi
ubuntu-logo.script some of my file content. replace the values to (0, 0, 0); for black
Window.SetBackgroundTopColor (0.16, 0.00, 0.12); # Nice colour on top of the screen fading to
Window.SetBackgroundBottomColor (0, 1.02, 1.02); # an equally nice colour on the bottom
ubuntu.css my file edited content at around line number 1814
#lockDialogGroup {
background-color: #000000; }
after editing the files, save & close all files..
then run sudo update-grub
Reboot to see the change.
The single long command for GNOME Shell removal is below
sudo apt purge adwaita-icon-theme gedit-common gir1.2-gdm-1.0 \
gir1.2-gnomebluetooth-1.0 gir1.2-gnomedesktop-3.0 gir1.2-goa-1.0 \
gnome-accessibility-themes gnome-bluetooth gnome-calculator gnome-calendar \
gnome-characters gnome-control-center gnome-control-center-data \
gnome-control-center-faces gnome-desktop3-data \
gnome-font-viewer gnome-getting-started-docs gnome-getting-started-docs-ru \
gnome-initial-setup gnome-keyring gnome-keyring-pkcs11 gnome-logs \
gnome-mahjongg gnome-menus gnome-mines gnome-online-accounts \
gnome-power-manager gnome-screenshot gnome-session-bin gnome-session-canberra \
gnome-session-common gnome-settings-daemon gnome-settings-daemon-common \
gnome-shell gnome-shell-common gnome-shell-extension-appindicator \
gnome-shell-extension-desktop-icons gnome-shell-extension-ubuntu-dock \
gnome-startup-applications gnome-sudoku gnome-system-monitor gnome-terminal \
gnome-terminal-data gnome-themes-extra gnome-themes-extra-data gnome-todo \
gnome-todo-common gnome-user-docs gnome-user-docs-ru gnome-video-effects \
language-pack-gnome-en language-pack-gnome-en-base language-pack-gnome-ru \
language-pack-gnome-ru-base language-selector-gnome libgail18 libgail18 \
libgail-common libgail-common libgnome-autoar-0-0 libgnome-bluetooth13 \
libgnome-desktop-3-19 libgnome-games-support-1-3 libgnome-games-support-common \
libgnomekbd8 libgnomekbd-common libgnome-menu-3-0 libgnome-todo libgoa-1.0-0b \
libgoa-1.0-common libpam-gnome-keyring libsoup-gnome2.4-1 libsoup-gnome2.4-1 \
nautilus-extension-gnome-terminal pinentry-gnome3 yaru-theme-gnome-shell
sudo apt autopurge
Note: if one have previously installed Vanilla GNOME desktop manually by sudo apt install vanilla-gnome-desktop and/or Ubuntu GNOME desktop by sudo apt install ubuntu-gnome-desktop and/or GNOME FlashBack by sudo apt install gnome-flashback gnome-panel and/or full GNOME by sudo apt install gnome - one have to execute extra removal commands below:
sudo apt purge adwaita-icon-theme geogebra-gnome gir1.2-gtd-1.0 \
gnome-accessibility-profiles gnome-applets-data gnome-audio gnome-backgrounds \
gnome-cards-data gnome-common gnome-desktop-testing gnome-dvb-daemon \
gnome-exe-thumbnailer gnome-extra-icons gnome-flashback-common \
gnome-humility-icon-theme gnome-hwp-support gnome-icon-theme \
gnome-icon-theme-gartoon gnome-icon-theme-gartoon-redux \
gnome-icon-theme-gperfection2 gnome-icon-theme-nuovo gnome-icon-theme-suede \
gnome-icon-theme-yasis gnome-mime-data gnome-nds-thumbnailer \
gnome-packagekit-data gnome-panel-control gnome-panel-data \
gnome-pkg-tools gnome-recipes-data gnome-remote-desktop gnome-settings-daemon-dev \
gnome-shell-pomodoro-data gnome-software-common gnome-software-doc \
gnome-theme-gilouche gnome-video-effects-extra gnome-video-effects-frei0r \
guile-gnome2-dev guile-gnome2-glib libgnome-autoar-doc libgnomecanvas2-common \
libgnomecanvas2-doc libgnomecanvasmm-2.6-doc libgnome-panel-doc libgnome-todo-dev \
libopenrawgnome7:amd64 libopenrawgnome-dev libreoffice-gnome libxine2-gnome:amd64 \
nautilus-sendto pidgin-gnome-keyring plymouth-theme-ubuntu-gnome-logo \
plymouth-theme-ubuntu-gnome-text ubuntu-gnome-wallpapers \
ubuntu-gnome-wallpapers-trusty ubuntu-gnome-wallpapers-utopic \
ubuntu-gnome-wallpapers-xenial ubuntu-gnome-wallpapers-yakkety
sudo apt autopurge
Then one can install any desktop environment of interest with commands like:
- Cinnamon -
sudo apt install cinnamon-desktop-environment
- KDE as in Kubuntu -
sudo apt install kubuntu-desktop^
- MATE as in Ubuntu MATE -
sudo apt install ubuntu-mate-desktop^
- Unity -
sudo apt install ubuntu-unity-desktop
- Xfce as in Xubuntu -
sudo apt install xubuntu-desktop^
then reboot, select newly installed desktop session and login to it.
Note: this method is applicable for Ubuntu 20.10 too.
Best Answer
Do this...
If you did remove/purge plymouth-theme-spinner then, as @norbert suggests:
If you didn't remove/purge plymouth-theme-spinner then just do:
Then select the bgrt option.
Reboot. Be happy!