get them all

dpkg --get-selections

packages

firacode font

sudo add-apt-repository universe
sudo apt update
sudo apt install fonts-firacode

st

sudo apt install fontconfig build-essential libxft-dev libharfbuzz-dev

git clone https://git.suckless.org/st
copy config.h from repo here
sudo make clean install

slock

sudo apt install libxext-dev libxrandr-dev

git clone https://git.suckless.org/slock
copy config.h from repo here
sudo make clean install

brave

guide here

sudo apt install apt-transport-https curl

sudo curl -fsSLo /usr/share/keyrings/brave-browser-archive-keyring.gpg https://brave-browser-apt-release.s3.brave.com/brave-browser-archive-keyring.gpg

echo "deb [signed-by=/usr/share/keyrings/brave-browser-archive-keyring.gpg arch=amd64] https://brave-browser-apt-release.s3.brave.com/ stable main" | sudo tee /etc/apt/sources.list.d/brave-browser-release.list

sudo apt update
sudo apt install brave-browser

disable display manager

second answer here

$ sudo vim /etc/default/grub

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
Change to:
GRUB_CMDLINE_LINUX_DEFAULT=" quiet text"

$ sudo update-grub

If you have only one OS you can disable the prober Add this line to the previous file

GRUB_DISABLE_OS_PROBER=true

themes & icons

Use lxappearance to customize theme

theme

sudo add-apt-repository ppa:numix/ppa
sudo apt-get update
sudo apt-get install numix-gtk-theme numix-icon-theme-circle numix-icon-theme-square

icons

sudo add-apt-repository ppa:noobslab/icons
sudo apt-get update
sudo apt-get install arc-icons

remove snap

guide here

sudo snap remove snap-store
sudo snap remove gtk-common-theme
sudo snap remove gnome-3-34-1804
sudo apt purge snapd