First, you should read the log files. Start with error.log: > InRelease Could not connect to localhost:3142 (127.0.0.1). - connect (111: > Connection refused) [IP: 127.0.0.1 3142] This is the port of the apt proxy apt-cacher-ng. You can disable using this in sources.list.
> WARNING: These unknown packages are removed from the installation list: > linux-image-amd64 initramfs-tools memtest86+ isc-dhcp-client grub-pc Ooops. Without a kernel, you machine will not boot. Let's look at fai.log. There you see the whole problem. You cannot connect to the Debian package mirror. You have to fix that. It does not make sense, that the install lcients wants to connect localhost for a package repository. So just remove the proxy config in sources.list. -- regards Thomas