TwiceBakedTech

a wonderful boot manager with beautiful interface

Install rEFInd using Linux

sudo apt-add-repository ppa:rodsmith/refind
sudo apt-get update
sudo apt-get install refind -y

Install rEFInd using Windows

https://www.rodsbooks.com/refind/installing.html#windows

Install rEFInd using a USB flash drive.

{NEEDS DOCUMENTATION}

Install using Git

#add rEFInd repository and install
sudo apt-add-repository ppa:rodsmith/refind
sudo apt update
sudo apt install refind -y
#install git dependencies
sudo apt install git -y
#add theme directory
sudo apt mkdir /boot/efi/EFI/refind/theme/
#clone theme
sudo cd /boot/efi/EFI/refind/theme/
sudo git clone https://github.com/Pr0cella/rEFInd-glassy.git
#add inclusion to refind.conf
echo include themes/rEFInd-glassy/theme.conf >> /boot/efi/EFI/refind/refind.conf

Add manually using curl

#add rEFInd repository and install
sudo apt-add-repository ppa:rodsmith/refind
sudo apt update
sudo apt install refind -y
#add theme directory
sudo apt mkdir /boot/efi/EFI/refind/theme/
#wget theme file
wget O- https://github.com/Pr0cella/rEFInd-glassy/archive/refs/heads/master.zip 
unzip to /boot/efi/EFI/refind/theme/
#add inclusion to refind.conf
echo include themes/rEFInd-glassy/theme.conf >> /boot/efi/EFI/refind/refind.conf