如何在Debian系统的Chromebook上为/etc/apt/sources.list添加non-free组件以安装Steam

Hey there! I totally get how overwhelming this can be when you're new to Debian—let's take this one step at a time, nice and slow. The issue you're hitting is that deb http://deb.debian.org/debian/ buster main contrib non-free isn't a command you run directly; it's a repository entry that needs to be added to your system's source list files. Here's exactly what to do:

Step 1: Back up your existing sources list (just in case!) #

First, let's make a copy of your current source file so we can revert if something goes wrong. Open your terminal and run this command:

sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak

• sudo lets you run commands with administrator (root) privileges—you'll need to enter your Chromebook's password when prompted.
• cp is the "copy" command, so this creates a backup named sources.list.bak of your original file.

Step 2: Edit the main sources list file #

We'll use nano, a simple text editor that works directly in the terminal (no fancy GUI needed). Run this command to open the file:

sudo nano /etc/apt/sources.list

Once the file opens, look for lines that start with deb http://deb.debian.org/debian/ buster main. It might look something like this:

deb http://deb.debian.org/debian/ buster main
deb-src http://deb.debian.org/debian/ buster main

Modify those lines to add contrib non-free at the end, so they become:

deb http://deb.debian.org/debian/ buster main contrib non-free
deb-src http://deb.debian.org/debian/ buster main contrib non-free

If you don't see these lines at all, just paste the two modified lines somewhere in the file.

Step 3: Save and exit the editor #

• Press Ctrl + O (that's the letter O, not zero) to save the changes. When prompted, press Enter to confirm the filename.
• Press Ctrl + X to exit the nano editor.

Step 4: Update your system's package cache #

Now tell Debian to fetch the latest information from the new repositories you added. Run this command:

sudo apt update

This might take a minute, and you'll see some text scrolling by—this is normal!

Alternative: Create a separate source file (instead of editing the main one) #

If you'd rather not modify the original sources.list file, you can create a new file just for Steam's required repositories:

1. Run this command to create and open a new file called steam.list in the sources.list.d folder:

   sudo nano /etc/apt/sources.list.d/steam.list
   

2. Paste this line into the file:

   deb http://deb.debian.org/debian/ buster main contrib non-free
   

3. Save and exit nano the same way as before (Ctrl+O then Ctrl+X).
4. Run sudo apt update to refresh the cache.

Once you've completed these steps, your system will have access to the non-free packages needed for Steam, and you can continue with the rest of the installation guide. If you run into any other issues along the way, don't hesitate to ask for more help!

内容的提问来源于stack exchange，提问作者Kieran Church