飞牛升级问题：fnOS1.1.26升级到fnOS1.1.29。
系统版本：X86
设备环境：
BUG现象：到openzfs-libzfs6安装就报升级失败，系统修复文件校验错误
出现频率：（必现）
apt install openzfs-libzfs6
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package openzfs-libzfs6 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
openzfs-libzfs7
E: Package 'openzfs-libzfs6' has no installation candidate
豆包得解释是:fnNAS 官方源已经升级 ZFS7，不再提供 libzfs6，同时官方更新服务器 403 禁止下载，自动更新彻底挂了。
