The main problem with installing Debian on a Dell T410 server is the driver of the NIC. The server's network card is not recognized during installation due to a firmware program that does not carry a network card in the installation CD. My solution is as follows: Install the system to the error page with the first Debian installation CD, prepare the first U-disk, download the relevant components from the following address (some of which may not be relevant, because the lazy, simply downloaded) copy to the root of the U disk or create a firmware directory, I am using the latter, according to CTRL+ALT+F2, will be prepared after the U disk mounted to/mnt, and then use CTRL+ALT+F5 continue to install, found this error solved
http://ftp2.halpanet.org/source/_dev/linux-firmware.git/Download all contents of the "Bnx2" directory
http://cdimage.debian.org/cdimage/unofficial/non-free/firmware/wheezy/current/Download "firmware.tar.gz"
Troubleshooting Installation Ossim (Debian series Linux system) firmware error