寻求在Chrome OS设备上无需开启开发者模式安装Ubuntu作为主系统的解决方案

Hey there, I totally get your hesitation around enabling Developer Mode—security risks are a legitimate worry, and it's frustrating when the supposed shortcut to enable it doesn't work. Let's break down your options here, focusing first on whether you can replace Chrome OS with Ubuntu without Developer Mode, and then addressing the Developer Mode activation issue in case you need to go that route.

无需开发者模式的替代方案（无法完全替换主系统） #

If you don't want to fully replace Chrome OS but still want to use Ubuntu functionality, Chrome OS has a built-in Linux (Beta) feature that's perfect for this—no Developer Mode required, and it's far more integrated than using Gnome Boxes:

• Head to Chrome OS Settings > Advanced > Developers > Linux development environment > Turn On
• Follow the on-screen prompts to set up your Ubuntu container. You'll get a full Ubuntu terminal, can install GUI apps via apt, and the environment is isolated from your main Chrome OS system, so security risks are minimal.

关于完全替换Chrome OS的可行性 #

Unfortunately, for most Chromebooks, you can't fully replace Chrome OS with Ubuntu without enabling Developer Mode first. Chrome OS locks down its bootloader by default, and unlocking it to boot from a USB (required for installing Ubuntu as the primary OS) requires accessing Developer Mode settings.

解决开发者模式激活失败的问题（若你决定走这条路线） #

If you do decide that replacing Chrome OS is the right path, let's troubleshoot why the key combo wasn't working—you might have used the wrong key:

• First, make sure your Chromebook is fully powered off (not just sleeping). Hold the power button until it shuts down completely.
• When turning it back on, immediately press and hold Ctrl + Shift + Alt + Refresh (the Refresh key is the one with the circular arrow icon, not the up/down arrow—this is probably where you went wrong!).
• You'll see a warning screen about Developer Mode; press Ctrl + D to confirm, then wait for the device to reboot and complete the setup.

Once Developer Mode is enabled:

1. Create a bootable Ubuntu USB drive using a tool like Rufus on another computer.
2. Plug the USB into your Chromebook, turn it on, and press Ctrl + U when the boot screen appears to launch from the USB.
3. Follow the Ubuntu installation prompts to replace Chrome OS with Ubuntu.

Just a quick note: If you go the Developer Mode route, keep an eye on security—stick to trusted software sources, keep your system updated, and you can always disable Developer Mode later if you need to.

备注：内容来源于stack exchange，提问作者cool boi