升级后的apt-获取更新显示仍然延伸杰西

Question

我从Jessie升级到Debian拉伸：

cat /etc/issue
Debian GNU/Linux 9 \n \l

当我运行apt-get update时，它仍然会检查jessie的源代码:例如：

Ign:5 http://ftp.debian.org/debian jessie-backports/main Translation-de_DE
Ign:7 http://ftp.debian.org/debian jessie-backports/main Translation-de
Ign:10 http://ftp.debian.org/debian jessie-backports/main Translation-en
Ign:11 http://ftp.debian.org/debian jessie-backports/main all DEP-11 Metadata
Ign:13 http://ftp.debian.org/debian jessie-backports/main amd64 DEP-11 Metadata
Ign:14 http://ftp.debian.org/debian jessie-backports/main DEP-11 64x64 Icons
Ign:15 http://ftp.debian.org/debian jessie-backports/main DEP-11 128x128 Icons

My /etc/apt/sources.list .only只包含：

deb http://deb.debian.org/debian/ stretch main contrib non-free
deb http://deb.debian.org/debian/ stretch-updates main contrib non-free
deb http://deb.debian.org/debian-security/ stretch/updates main contrib non-free

我不明白为什么。

Answer 1

替换了/etc/apt/ Replaced .list.d/上所有文件上的debian版本，就像A.B.建议的那样，它也为我解决了这个问题。