关于Ubuntu 22.04.2 LTS镜像文件超出DVD容量无法刻录的技术咨询

Hey there, I totally get the frustration here—dealing with mismatched storage sizes when you're trying to create installation media is such a headache! Let's break down what's going on and your options:

First, why the size mismatch? #

The advertised 4.7GB for a single-layer DVD is a decimal measurement (1GB = 1,000,000,000 bytes), but actual storage uses binary (1GB = 1,073,741,824 bytes). That means a single-layer DVD only has ~4.3GB of usable space, while Ubuntu 22.04.2 LTS's desktop image clocks in around 4.9GB—way too big for a single-layer disc. And yes, this is the official image, so you didn't download anything wrong!

Your solutions, ranked by reliability: #

• Use a USB flash drive (highly recommended)
  This is the standard method now for Ubuntu installations, and it's way more flexible. You'll need an 8GB or larger USB drive. You can use:

  • Ubuntu's built-in Startup Disk Creator (if you're already running Ubuntu)
  • Third-party tools like Rufus (works on Windows, macOS, Linux)
    Just format the drive, select your Ubuntu ISO file, and let the tool handle writing the bootable media. Most modern computers support USB boot, so this should work seamlessly.

• Burn to a dual-layer (DL) DVD
  If you absolutely need to use a DVD, you'll have to pick up a dual-layer DVD (labeled as 8.5GB). These have enough space to fit the 4.9GB ISO. Just make sure your DVD burner supports dual-layer discs, and in your burning software, select the dual-layer option when writing the image.

Quick check: #

Double-check you didn't accidentally download the server edition (though that's smaller, so it wouldn't cause this issue) — but from your description, it's clearly the desktop image which has grown beyond single-layer DVD capacity in recent releases.

Hope this helps you get your Ubuntu installation media sorted out!

备注：内容来源于stack exchange，提问作者EJSJr