由于找不到错误包，无法安装“sudo”以外的任何东西有人有任何想法吗？我在这里发帖是因为几乎所有问题都已得到解决，主要是想安装 Steam 和其他一些应用程序，例如 leafpad。请记住，我一直在使用 Ubuntu，但最近改为 Debian，只是为了尝试一下。
如果您需要更多信息，请发表评论，谢谢。顺便说一句，我检查了所有其他类似的问题，但没有一个有帮助。
Debian 杰西 8.6
错误：
$ sudo apt-get install <package>
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package <package>
Sources.list 文件：#
# deb cdrom:[Debian GNU/Linux 8.6.0 _Jessie_ - Official amd64 DVD Binary-1 20160917-14:25]/ jessie contrib main
#deb cdrom:[Debian GNU/Linux 8.6.0 _Jessie_ - Official amd64 DVD Binary-1 20160917-14:25]/ jessie contrib main
deb http://security.debian.org/ jessie/updates main contrib non-free
deb-src http://security.debian.org/ jessie/updates main contrib non-free
# jessie-updates, previously known as 'volatile'
deb http://ftp.au.debian.org/debian/ jessie-updates main contrib non-free
deb-src http://ftp.au.debian.org/debian/ jessie-updates main contrib non-free
答案1
您似乎缺少sources.list 文件。转到/etc/apt并创建一个名为sources.list的新文件
我想你在 Debian Stable ，所以把这些内容放进去：
deb http://httpredir.debian.org/debian/ jessie main non-free contrib
deb http://httpredir.debian.org/debian/ jessie-updates main contrib non-free
deb http://security.debian.org/ jessie/updates main contrib non-free
deb-src http://httpredir.debian.org/debian/ jessie main non-free contrib
deb-src http://httpredir.debian.org/debian/ jessie-updates main contrib non-free
deb-src http://security.debian.org/ jessie/updates main contrib non-free
如果您将来想尝试 Debian 测试（最新的应用程序、内核等），您需要在此文件中添加测试存储库行，如下所示：
deb http://httpredir.debian.org/debian/ testing main non-free contrib
deb http://httpredir.debian.org/debian/ testing-updates main contrib non-free
deb http://security.debian.org/ testing/updates main contrib non-free
deb-src http://httpredir.debian.org/debian/ testing main non-free contrib
deb-src http://httpredir.debian.org/debian/ testing-updates main contrib non-free
deb-src http://security.debian.org/ testing/updates main contrib non-free
为了进行比较，请查看我的 /etc/apt 文件夹：
root@debian:/home/gv/Desktop/PythonTests# ls -al /etc/apt
total 56
drwxr-xr-x 6 root root 4096 Jan 4 19:16 .
drwxr-xr-x 131 root root 12288 Jan 4 19:17 ..
drwxr-xr-x 2 root root 4096 Jan 5 00:38 apt.conf.d
-rw-r--r-- 1 root root 99 Dec 27 08:42 listchanges.conf
-rw-r--r-- 1 root root 218 Jan 1 21:53 preferences
drwxr-xr-x 2 root root 4096 Mar 12 2016 preferences.d
-rw-r--r-- 1 root root 1558 Jan 1 22:00 sources.list
drwxr-xr-x 2 root root 4096 Jan 1 21:38 sources.list.d
-rw-r--r-- 1 root root 4171 Jan 1 21:38 trusted.gpg
drwxr-xr-x 2 root root 4096 Dec 27 02:58 trusted.gpg.d