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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →You can install Linux on a server without booting directly from an ISO by using PXE/network boot, booting installer files from an existing disk and bootloader, or provisioning a virtual machine from a network installation source. These methods still need an installer source: it may download an ISO or packages after startup, or use a local ISO file without booting from it. Choose based on the server’s firmware and architecture, your network access, and whether a working bootloader is already installed.
Choose the method that fits your server
| Method | Best suited to | What you need | Important limitation |
|---|---|---|---|
| PXE/network boot | Physical servers whose firmware supports network boot | Network boot configuration and services such as DHCP/BOOTP and TFTP, plus access to the installer source | Coordinate DHCP changes with the network administrator; firmware mode and boot files must match. |
| Installer files on disk with GRUB | A server that already has a usable bootloader | Access to place compatible installer kernel and initrd files, and usually network connectivity for a netboot install | Repartitioning the disk holding those files can disrupt the installation. |
| Disk-hosted ISO with Debian hd-media | A server where you want to avoid network access during installation | Debian hd-media kernel/initrd files and an ISO stored on disk | You still use a local ISO file; you simply do not boot from it directly. |
| Virtual-machine provisioning | A guest VM managed by a hypervisor | A distribution tree, ISO, local directory, PXE service, or explicit kernel/initrd paths | This configures virtual boot devices, not the firmware of a physical server. |
For physical-server PXE, Canonical’s Ubuntu amd64 netboot guide describes a flow in which DHCP/BOOTP supplies network and boot information, TFTP serves bootloader configuration, and the initrd configures networking and fetches the server ISO. The installer then mounts that ISO and proceeds with installation. Thus, “without booting from an ISO” does not necessarily mean “without using an ISO anywhere.”
Install on bare metal with PXE
What happens during network boot
- Enable network boot in the target server’s firmware and select the correct network interface and firmware mode.
- The client obtains network configuration and boot information, commonly through DHCP or BOOTP.
- The bootloader and its configuration are supplied over the network; the boot configuration identifies the installer kernel and RAM disk.
- The initrd brings up networking and retrieves the installer source. In Ubuntu’s documented amd64 flow, it downloads and mounts the server ISO before continuing installation.
PXE is useful when no local USB, CD, or ISO boot is available, particularly when you manage a controlled provisioning network. It is not the same as booting an already-installed diskless Linux system that depends on a server at every startup; this procedure network-boots the installer.
Prepare network services safely
Ubuntu’s guide demonstrates dnsmasq for DHCP and TFTP, with a DHCP range, boot-file selection for legacy versus EFI clients, and a TFTP root. These are examples with network assumptions, not a configuration to copy blindly onto a production LAN. An additional DHCP service can disrupt existing clients or direct machines to the wrong boot server, so coordinate with whoever administers the network before enabling one.
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The Ubuntu example points to a release-specific server ISO URL; the ISO can instead be hosted locally. Its kernel argument cloud-config-url=/dev/null prevents cloud-init from downloading the ISO a second time. Follow the current release’s instructions and adapt the source location to your environment rather than assuming a URL or file path remains constant.
Match firmware mode and architecture
Confirm the server’s CPU architecture and whether it is booting in UEFI or legacy BIOS mode. Ubuntu’s amd64 documentation covers both modes and calls for mode-appropriate bootloader files; it distinguishes signed EFI boot components from the legacy PXELINUX path. Secure Boot requirements also affect which EFI components can start. A mismatch between the firmware mode, architecture, bootloader, and installer files commonly prevents the initial boot.
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Boot installer files from an existing disk
Use a netboot kernel and initrd
The Debian stable amd64 installation guide documents placing the installer’s vmlinuz and initrd.gz on a hard drive and starting them from an existing operating system or bootloader. This can avoid PXE infrastructure, but a netboot installer still needs network access to retrieve remaining installation components. The guide notes that the disk can be repartitioned by this process, so ensure the boot files remain available until the installer has started and take particular care with any automatic partitioning choices.
Ubuntu Community Help Wiki also describes an internet netboot approach that stores boot files on disk and uses an already installed, bootable GRUB or GRUB2. It avoids removable media and a locally configured PXE server, but it depends on a functioning existing Linux/GRUB installation. Because the page is community documentation and may be dated, verify release-specific file locations and commands against current distribution documentation before using them.
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Use a local ISO without booting from it
If the goal is to avoid booting directly from an ISO, rather than to avoid keeping an ISO file, Debian’s hd-media route is another option. It uses a kernel and initrd that can find an ISO stored on disk, allowing installation without network access. This differs from netboot: the local ISO provides the installation content, while the machine starts the installer through the disk’s bootloader.
Provision a Linux virtual machine
For a guest machine, the hypervisor controls virtual boot devices, so you do not need to change a physical server’s firmware. The Ubuntu virt-install manpage documents several ways to start a guest installation:
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These are VM installation options, not instructions for configuring the network boot firmware of a bare-metal server. Check the installed virt-install version’s documentation when selecting options for a particular host.
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Check these requirements before starting
- Firmware and CPU: Identify UEFI or legacy BIOS mode, CPU architecture, and any Secure Boot requirement. Use compatible boot components and installer files.
- Network authority: For PXE, establish who controls DHCP/BOOTP and where TFTP files will be served. Do not add a competing DHCP server to a production network.
- Existing boot path: Disk-based netboot requires a working bootloader and permission to place files on a readable disk partition. Protect those files until the installer has loaded.
- Installer connectivity: Verify the target can reach the network location from which it must obtain the ISO or installation components. If it cannot, consider Debian’s disk-hosted ISO approach.
- Release compatibility: Keep the bootloader, kernel/initrd, installer source, and architecture paths aligned to a compatible release. Ubuntu’s cited netboot guide contains Noble-era examples; distribution paths and release URLs can change.
- Disk consequences: Decide which disk to install to and whether it may be erased or repartitioned. Review partitioning choices carefully, especially when the boot files are on that same disk.
Common problems and what to check
- The server does not find a network boot file: Check that network boot is enabled, the correct interface is selected, DHCP/BOOTP provides the intended boot information, and the boot filename suits the firmware mode.
- The bootloader starts but the installer does not: Confirm that the kernel and initrd are reachable and match the target architecture and release. For UEFI, verify the EFI boot components and Secure Boot compatibility.
- The installer starts but cannot fetch packages or an ISO: Check network configuration, name resolution, routing, and access to the chosen installation source. A disk-hosted ISO can avoid reliance on that network path when using Debian hd-media.
- The disk-based method fails after partitioning begins: Reassess whether installer files or the active boot path are located on a disk being altered. Do not proceed with a partition layout that could remove files needed to continue.
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