Multiboot Solutions

Modern Multiboot Solutions for PC

This guide covers the best multiboot solutions for modern PCs, with a focus on cross-OS management.

🏆 Recommended Solutions

1. systemd-boot (Best for NixOS Users)

Pros:

Native to systemd/Linux systems
Excellent NixOS integration
Simple configuration files
Fast boot times
Secure Boot support
Works well with efibootmgr from Linux

Cons:

Linux-only management
No visual interface (by default)
Limited theme options

Setup:

# Enable systemd-boot in configuration.nix
boot.loader.systemd-boot.enable = true;
boot.loader.efi.canTouchEfiVariables = true;

# Rebuild
sudo nixos-rebuild switch

Management from Linux:

# List boot entries
bootctl list

# Set default boot
sudo bootctl set-default nixos-default.conf

# Update entries
sudo bootctl update

2. rEFInd (Best for Cross-OS Management)

Pros:

OS-agnostic management
Beautiful visual interface
Auto-detects operating systems
Themeable and customizable
Works from any OS
Network boot support
Secure Boot compatible

Cons:

Manual installation required
More complex setup
Larger disk footprint

Setup:

# Install rEFInd
refind-setup

# Or manually install
sudo refind-install

# Configure theme
sudo nano /boot/EFI/refind/refind.conf

Management from Any OS:

Edit /boot/EFI/refind/refind.conf from any OS
Use rEFInd configuration tools
Visual boot menu selection

3. Ventoy (Best for Testing/Multimedia)

Pros:

Boot multiple ISOs from one USB
No need to extract ISOs
Supports persistence
UEFI and Legacy support
Easy to add/remove ISOs

Cons:

USB-based only
Not for permanent multiboot
Slower boot from USB

Setup:

# Create Ventoy USB
sudo ventoy2disk -I /dev/sdX

# Copy ISO files to USB
cp *.iso /media/Ventoy/

4. UEFI Direct Boot (Advanced)

Pros:

No boot loader needed
Fastest boot times
Direct OS control
Works with any OS

Cons:

Manual EFI management
No boot menu (single OS)
Requires UEFI firmware setup

🔧 Configuration Comparison

Feature	systemd-boot	rEFInd	GRUB	Ventoy	UEFI Direct
Cross-OS Management	❌	✅	❌	✅	✅
Visual Interface	❌	✅	✅	✅	❌
NixOS Integration	✅	⚠️	✅	❌	⚠️
Theme Support	❌	✅	✅	✅	❌
Network Boot	❌	✅	⚠️	❌	❌
Secure Boot	✅	✅	⚠️	✅	✅
Setup Difficulty	Easy	Medium	Easy	Easy	Hard

🚀 Recommended Setup

For Daily Use (NixOS + Windows):

# Use systemd-boot for NixOS
boot.loader.systemd-boot.enable = true;

# Add rEFInd for visual management
# (install manually with refind-setup)

For Maximum Flexibility:

# Primary: systemd-boot
boot.loader.systemd-boot.enable = true;

# Backup: Ventoy USB for testing
environment.systemPackages = [ pkgs.ventoy-full ];

# Emergency: rEFInd for recovery
# (install manually)

📱 Cross-OS Boot Management

From Windows:

rEFInd Configuration:
- Mount EFI partition: mount \\?\Volume{EFI}\ E:
- Edit: E:\EFI\refind\refind.conf
- Reboot to see changes
EasyBCD:
- Visual boot manager
- Works with rEFInd entries
- Can set timeout/default
UEFI Firmware:
- Reboot → UEFI/BIOS
- Boot Manager menu
- Select boot entry

From Linux:

systemd-boot:

bootctl list
sudo bootctl set-default windows.conf

efibootmgr:

sudo efibootmgr
sudo efibootmgr --bootnext 0001

rEFInd Config:
Terminal window
```
sudo nano /boot/EFI/refind/refind.conf
```

From Mobile/Any Device:

Web Interface (if set up):
- Access boot management web UI
- Change boot order remotely

SSH Access:

ssh luxus@lea-ip "sudo efibootmgr --bootnext 0001"

🛠️ Migration from GRUB

Step 1: Backup Current Setup

# Backup GRUB configuration
sudo cp /boot/grub/grub.cfg /boot/grub/grub.cfg.backup

# Backup EFI entries
sudo efibootmgr > efibootmgr-backup.txt

Step 2: Install systemd-boot

# Add to configuration.nix
boot.loader.systemd-boot.enable = true;
boot.loader.grub.enable = false;

# Rebuild
sudo nixos-rebuild switch

Step 3: Optional rEFInd

# Install rEFInd alongside systemd-boot
refind-setup

# This gives you both options

Step 4: Test

# Reboot and test new boot manager
sudo reboot

# Should see systemd-boot menu or rEFInd interface

🎮 Gaming Considerations

For Gaming Performance:

UEFI Direct Boot: Fastest, no boot loader overhead
systemd-boot: Minimal overhead, good performance
rEFInd: Slight overhead, but convenient
GRUB: Most overhead, avoid for gaming

Recommended Gaming Setup:

Primary: systemd-boot (fast, reliable)
Secondary: rEFInd (for convenience)
Emergency: UEFI direct boot

🔧 Advanced Configuration

Custom systemd-boot Entries:

boot.loader.systemd-boot.extraEntries = {
  "windows.conf" = ''
    title   Windows 11
    efi     /EFI/Microsoft/Boot/bootmgfw.efi
    sortKey windows
  '';
  "recovery.conf" = ''
    title   System Recovery
    efi     /EFI/NixOS/nixos-recovery.efi
    sortKey recovery
  '';
};

rEFInd Theme Configuration:

# Install theme
sudo mkdir -p /boot/EFI/refind/themes
sudo git clone https://github.com/EvanPurkhiser/rEFInd-minimal /boot/EFI/refind/themes/minimal

# Enable theme in refind.conf
echo "include themes/minimal/theme.conf" | sudo tee -a /boot/EFI/refind/refind.conf

Network Boot Setup:

# Setup PXE boot server
setup-network-boot

# Configure rEFInd for network boot
echo "netboot" | sudo tee -a /boot/EFI/refind/refind.conf

📋 Quick Reference

Commands:

# systemd-boot
bootctl list                    # List entries
sudo bootctl set-default X     # Set default
sudo bootctl update            # Update entries

# rEFInd
refind-setup                   # Install rEFInd
refind-update                  # Update configuration
sudo nano /boot/EFI/refind/refind.conf  # Edit config

# EFI management
sudo efibootmgr                # List boot entries
sudo efibootmgr --bootnext X   # Set next boot

# Ventoy
ventoy2disk -I /dev/sdX        # Create Ventoy USB

Files:

/boot/loader/entries/ - systemd-boot entries
/boot/EFI/refind/refind.conf - rEFInd configuration
/boot/EFI/refind/themes/ - rEFInd themes
/boot/loader/loader.conf - systemd-boot config

🎯 Recommendation

For your NixOS + Windows setup:

Primary: Use systemd-boot (better NixOS integration)
Secondary: Install rEFInd for visual cross-OS management
Testing: Keep Ventoy USB for trying other distros
Emergency: Know UEFI boot manager access

This gives you the best of all worlds: fast NixOS boots, visual management from any OS, and flexibility for testing.