在Ubuntu试用模式下安装光盘刻录软件的可行性咨询及问题求助

Hey there, let's work through this problem together—totally get why you need this sorted for your key backup deadline next week, that's a critical task!

The main issue you're hitting is that when running Ubuntu in "Try Ubuntu" live mode, the default package sources don't have all the necessary repositories enabled. Apps like Brasero and K3b live in the Universe repository, which isn't always turned on by default in the live environment. That's why apt install can't locate those packages.

Here's how to fix it step by step:

• Launch a terminal quickly by pressing Ctrl+Alt+T.
• First, enable the Universe repository to access those missing apps:
  sudo add-apt-repository universe
• Next, update your system's package list so it knows about the newly available software:
  sudo apt update
• Now you can install your preferred burning tool without issues. Pick one of these commands:
  • For Brasero: sudo apt install brasero
  • For K3b: sudo apt install k3b

A quick heads-up: since you're in the live "Try Ubuntu" environment, any software you install will disappear once you restart the computer. But that's perfect for your use case—you just need it long enough to burn your key backup to CD.

Also, make sure your CD-ROM burner is recognized by the live system. You can run lsblk in the terminal to check if your optical drive shows up in the list. If it does, the burning software should detect it automatically once installed.

备注：内容来源于stack exchange，提问作者Kjeld Flarup