我刚刚创建了一个 Ubuntu 21.04 USB 拇指驱动器并在 Live/Try 模式下启动它。
我打开一个终端，运行sudo apt update和sudo apt-get install apt-file：
ubuntu@ubuntu:~$ sudo apt update
Ign:1 cdrom://Ubuntu 21.04 _Hirsute Hippo_ - Release amd64 (20210420) hirsute InRelease
Hit:2 cdrom://Ubuntu 21.04 _Hirsute Hippo_ - Release amd64 (20210420) hirsute Release
Hit:4 http://archive.ubuntu.com/ubuntu hirsute InRelease
Get:5 http://archive.ubuntu.com/ubuntu hirsute-updates InRelease [109 kB]
Get:6 http://security.ubuntu.com/ubuntu hirsute-security InRelease [101 kB]
Fetched 209 kB in 1s (286 kB/s)
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
280 packages …