如果我运行，apt list python-py我会看到该包python-py（我刚刚通过 安装，sudo apt install python-py以为它是其他东西）：
Listing... Done
python-py/bionic,bionic 1.5.2-1 all
尝试通过运行来卸载该包sudo apt remove python-py，我收到以下提示：
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package 'python-py' is not installed, so not removed
Starting pkgProblemResolver with broken count: 0
Starting 2 pkgProblemResolver with broken count: 0
Done
0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.
apt好像自相矛盾，这是怎么回事？
答案1
该apt list命令不仅仅检查已安装的软件包。它还会检查所有已知来源的所有已知软件包的数据库，无论是否已安装。
apt list以下是已安装包的示例：
$ apt list python3
Listing... Done
python3/cosmic-updates,now 3.6.7-1~18.10 amd64 [installed]
apt list会清楚地告诉您哪些包已[安装]。
答案2
欢迎来到 AskUbuntu SE！我认为你误以为安装了 python-py。apt list 将列出所有可用的软件包（如 user535733 所说）这里有一张截图来向你保证 :)
