我在网上搜索了一下，我所能得到的只是如何升级dist。然而，我想要的是留在自己满意的地方。
我使用 simple-cdd 制作了一张定制的 Debian 安装 DVD。我检查了 DVD ISO 并确认它包含拉伸分布。然而，在我安装DVD之后，系统崩溃了，这意味着安装程序在未经我同意的情况下自动升级了dist。
有办法阻止这一切吗？我可以在预置文件中做些什么？
这是 DVD 上我的预置文件的相关部分
### Mirror settings
# If you select ftp, the mirror/country string does not need to be set.
d-i mirror/protocol string http
d-i mirror/country string manual
d-i mirror/http/hostname string 192.168.0.10
d-i mirror/http/directory string /debian/
d-i mirror/http/proxy string
# Suite to install.
d-i mirror/suite string stretch
# Suite to use for loading installer components (optional).
#d-i mirror/udeb/suite string stretch
### Apt setup
# You can choose to install non-free and contrib software.
d-i apt-setup/non-free boolean true
d-i apt-setup/contrib boolean true
# Uncomment this if you don't want to use a network mirror.
d-i apt-setup/use_mirror boolean false
# Select which update services to use; define the mirrors to be used.
# Values shown below are the normal defaults.
d-i apt-setup/services-select multiselect
#d-i apt-setup/security_host string security.debian.org
# Additional repositories, local[0-9] available
d-i apt-setup/local0/repository string \
http://debian.myserver.com/debian stable main