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A bootable device can be storage devices like floppy disk, CD-ROM, USB flash drive, a partition on a hard disk (where a hard disk stores multiple OS, e.g Windows and Fedora), a storage device on local network, etc. [7] A hard disk to boot Linux stores the Master Boot Record (MBR), which contains the first-stage/primary bootloader in order to be ...
It replaced usplash (which uses the Linux framebuffer) to bring Ubuntu closer to the goal of a 10-second boot time by version 10.04. X Window System Command-line utilities and shell builtins included in Ubuntu
Operating system selection at boot time consequently depends on the bootloader configured within the primary partition that has the boot or "active" flag set on its partition table entry, which could be a bootloader of DOS, OS/2, eComStation, ArcaOS [4] or BSD, in addition to Linux or Windows.
If the user chooses to boot the live image rather than execute an installer at boot time, there is still the option to then use the Ubuntu Desktop Installer once booted into the live environment. [80] The Ubuntu Desktop Installer replaced the former Ubiquity installer since Ubuntu 23.04. [81]
Other Linux distributions (such as Fedora and Ubuntu) generate a more generic initrd image. These start only with the device name of the root file system (or its UUID) and must discover everything else at boot time. In this case, the software must perform a complex cascade of tasks to get the root file system mounted:
providing for a network installation of Linux distributions like Fedora, Debian, etc., providing machines via PXE boot (or similar means) with a small size operation system (e.g., DSL, Puppy Linux, FreeDOS). Providing a DRBL-Server Installation on a machine running a supported Linux distribution via installation script, Live CD.
GRUB 2, elilo and systemd-boot serve as conventional, full-fledged standalone UEFI boot managers (a.k.a. bootloader managers) for Linux. Once loaded by a UEFI firmware, they can access and boot kernel images from all devices, partitions and file systems they support, without being limited to the EFI system partition.
Tiny Core Linux is an example of Linux distribution that run from RAM. This is a list of Linux distributions that can be run entirely from a computer's RAM, meaning that once the OS has been loaded to the RAM, the media it was loaded from can be completely removed, and the distribution will run the PC through the RAM only.