To be useful, the rEFInd boot manager must be installed to the computer's EFI System Partition (ESP) or other EFI-accessible location. In most cases, an NVRAM entry describing rEFInd's location must also be created. These steps can be performed manually; however, the refind-install command provides an automated way to perform these tasks under both Linux and OS X. The exact behavior and options vary depending on the OS, however.

Some details that can affect how the script runs include the following:

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If you run the script as an ordinary user, it attempts to acquire root privileges by using the sudo command. This works on Mac OS X and some Linux installations (such as under Ubuntu or if you've added yourself to the sudo users list), but on some Linux installations this will fail. On such systems, you should run refind-install as root.

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Under OS X, you can run the script with a mouse by opening a Terminal session and then dragging-and-dropping the refind-install file to the Terminal window. You'll need to press the Return or Enter key to run the script.

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If you're using OS X 10.7's Whole Disk Encryption (WDE) feature, or the loogical volumes feature in OS X 10.10, you must install rEFInd to the ESP or to a separate HFS+ partition. The default in rEFInd 0.8.4 and later is to install to the ESP. If you prefer to use a separate HFS+ volume, the --ownhfs device-file option to refind-install is required.

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If you're not using WDE or logical volumes, you can install rEFInd to the OS X root (/) partition by using the --notesp option to refind-install. Using this option is recommended when upgrading from a working rEFInd installation in this location.

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If you're replacing rEFIt with rEFInd on a Mac, there's a chance that refind-install will warn you about the presence of a program called /Library/StartupItems/rEFItBlesser and ask if you want to delete it. This program is designed to keep rEFIt set as the boot manager by automatically re-blessing it if the default boot manager changes. This is obviously undesirable if you install rEFInd as your primary boot manager, so it's generally best to remove this program. If you prefer to keep your options open, you can answer N when refind-install asks if you want to delete rEFItBlesser, and instead manually copy it elsewhere. If you subsequently decide to go back to using rEFIt as your primary boot manager, you can restore rEFItBlesser to its place.

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If you intend to boot BIOS-based OSes on a UEFI-based PC, you must edit the refind.conf file's scanfor line to enable the relevant searches. This is not necessary on Macs, though; because of the popularity of dual boots with Windows on Macs, the BIOS/legacy scans are enabled by default on Macs.

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On Linux, refind-install checks the filesystem type of the /boot directory and, if a matching filesystem driver is available, installs it. Note that the '/boot directory' may be on a separate partition or it may be part of your root (/) filesystem, in which case the driver for your root filesystem is installed. This feature is unlikely to work properly from an emergency system, although it might if you have a separate /boot partition and if you mount that partition at /boot in your emergency system, and the ESP at /boot/efi.

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On OS X, refind-install checks your partition tables for signs of a Linux installation. If such a sign is found, the script installs the EFI filesystem driver for the Linux ext4 filesystem. This will enable rEFInd to read your Linux kernel if it's on an ext2, ext3, or ext4 filesystem. Note that some configurations will require a /boot/refind_linux.conf file, which can be reliably generated only under Linux. (The mkrlconf script that comes with rEFInd will do this job once you've booted Linux.) In the meantime, you can launch GRUB from rEFInd or press F2 or Insert twice after highlighting the Linux option in rEFInd. This will enable you to enter a root=/dev/whatever specification, where /dev/whatever is the device identifier of your Linux root (/) filesystem.

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If you run refind-install on Linux and if /boot/refind_linux.conf doesn't already exist, refind-install creates this file and populates it with a few sample entries. If /boot is on a FAT partition (or HFS+ on a Mac), or if it's on an ext2fs, ext3fs, ext4fs, ReiserFS, Btrfs, or HFS+ partition and you install an appropriate driver, the result is that rEFInd will detect your kernel and will probably boot it correctly. Some systems will require manual tweaking to refind_linux.conf, though -- for instance, to add dolvm to the boot options on Gentoo systems that use LVM.

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If you pass the --shim option to the script (along with a filename for a Shim binary), the script sets up for a Secure Boot configuration via Shim. By default, this causes the rEFInd binary to be renamed as grubx64.efi. Recent versions of Shim support passing the name of the follow-on program to Shim via a parameter, though. If you want to use this feature, you can pass the --keepname option to refind-install.

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The rEFInd partition doesn’t need to be large (50 MB will be enough); it must use the HFS+ (Mac OS Extended) file system. To create it, you have three options: From macOS, by shrinking the macOS partition: open Disk Utility, choose your drive, select Partition, add a new partition, set its size and file system (in that order!). REFInd is a UEFI boot manager capable of launching EFISTUB kernels. It is a fork of the no-longer-maintained rEFIt and fixes many issues with respect to non-Mac UEFI booting. It is designed to be platform-neutral and to simplify booting multiple operating system.

After you run refind-install, you should peruse the script's output to ensure that everything looks OK. refind-install displays error messages when it encounters errors, such as if the ESP is mounted read-only or if you run out of disk space. You may need to correct such problems manually and re-run the script. In some cases you may need to fall back on manual installation, which gives you better control over details such as which partition to use for installation.