ubantu系统安装后报错no bootable device found

### Ubuntu 18.01 Installation Guide #### Prerequisites Before starting the installation of Ubuntu 18.01, ensure that the system meets minimum hardware requirements and prepare an installation medium such as a USB drive or DVD with the ISO image burned onto it. #### Booting from Installation Medium To begin installing Ubuntu 18.01, insert the prepared bootable media into the computer and restart it. Enter BIOS/UEFI settings by pressing F2, Esc, Del, or another key depending on the manufacturer's instructions to change the boot order so that the machine boots from the external device first[^1]. #### Initial Setup Once booted from the installation media, choose "Install Ubuntu" when prompted. Select language preferences and continue through initial setup screens which include keyboard layout selection and updates/downloads during installation options. #### Partitioning Disk Space When asked about where to install Ubuntu, one can either opt for automatic partitioning ("Erase disk and install Ubuntu") or manual configuration if custom setups are required like dual-boot scenarios alongside existing operating systems. #### Time Zone Configuration Select location information accurately since this affects time zone settings post-installation; then proceed further without any issues related specifically mentioned within provided references but generally applicable based upon standard practices surrounding Linux distributions including those derived therefrom. #### User Account Creation Create user accounts specifying full name, username, password details ensuring strong passwords policies adhere accordingly while setting up security measures early enough before moving forward towards finalizing steps involved hereinunderneath described process flowchart diagrammatically represented below: ```bash # Example command line interaction not directly sourced but indicative of typical workflow encountered throughout procedure outlined above. $ sudo adduser newusername ``` #### Completing Installation After all configurations have been set correctly according to personal needs/preferences specified earlier stages prior reaching completion point now just wait until installer finishes copying files over necessary components needed start enjoying fresh copy newly installed OS environment ready use out box experience offered today’s modern desktop platforms alike others similar kind found elsewhere too! --related questions-- 1. What considerations should be taken into account regarding hardware compatibility? 2. How does changing boot orders vary between different manufacturers' machines? 3. Can you explain more about configuring partitions manually versus automatically? 4. Are there specific recommendations for creating secure passwords during setup? 5. Is additional software available immediately after completing the basic installation?

### Ubuntu 20.04 LTS Live Server Installation Guide and Features #### Overview of Ubuntu 20.04 LTS Live Server Ubuntu 20.04 LTS (Long Term Support), also known as Focal Fossa, offers a stable environment for servers with support until April 2025. The live server edition allows users to try out or install the operating system without making changes to their hard drive initially. #### System Requirements To ensure smooth operation during installation and usage, minimum hardware requirements include at least 1GHz processor, 1GB RAM (for minimal installation; 2GB recommended), and around 25GB disk space depending on what services will be installed later[^2]. #### Downloading ISO Image The first step involves downloading an official ISO image file specifically designed for the live server variant from Canonical's website. This ISO contains all necessary packages required for setting up various types of servers including web hosting, database management systems etc.[^1] #### Boot Process Once downloaded, create bootable media using tools like Rufus on Windows or Etcher on Linux/MacOS. After preparing this USB stick/DVD-ROM, insert it into your target machine and reboot while selecting said device as primary bootloader through BIOS/UEFI settings menu options available upon startup. #### Initial Setup Steps During Installation After successfully entering the installer interface via selected medium: - Choose language preferences. - Select keyboard layout according to regional standards. - Configure network interfaces by providing static IP addresses if needed or opting DHCP configuration automatically provided by router/modem devices connected within local area networks(LANs). #### Post-installation Configuration Tasks Following completion of base OS setup process: - Update existing software repositories list cache immediately after gaining internet connectivity post-reboot following initial installation phase. - Install additional drivers/firmware components that may not have been included originally due to licensing restrictions but are essential for optimal performance especially concerning wireless adapters, graphics cards among others. - Secure newly established environments against unauthorized access attempts early-on utilizing built-in firewall utilities alongside configuring SSH service properly restricting root login remotely along other best practices advised widely across community forums dedicated towards enhancing security posture effectively. ```bash sudo apt update && sudo apt upgrade -y sudo ufw enable sudo ufw default deny incoming ``` #### Key Features Introduced in Version 20.04 Some notable enhancements introduced since previous releases encompass improved stability thanks largely owing much effort put forth stabilizing kernel versions used throughout development cycles leading up till final release date besides introducing new functionalities such as ZFS filesystem integration natively supported directly inside GRUB bootloader menus allowing easier deployment scenarios involving complex storage configurations requiring advanced snapshot capabilities offered only previously found outside mainstream distributions' offerings elsewhere before now becoming readily accessible here too!