On 17/12/2025 at 18:56, travis meeks wrote:
I encountered an issue where the Debian Installer (d-i) persisted an incorrect initial network configuration despite my correcting it during the installation steps.
Yes, AFAICS here is how it works:- during "Configure the network", netcfg writes "basic" network configuration files (/etc/network/interfaces /etc/networks /etc/hostname /etc/resolv.conf /etc/hosts) and configuration files for NetworkManager and Netplan in the installer environment; - during "Install the base system", base-installer.d/40netcfg copies "basic" network configuration files to the target environment; - during "Finish the installation", finish-install.d/55netcfg-copy-config writes configuration files for NetworkManager or Netplan and re-writes /etc/network/interfaces with only the loopback interface in the target environment if either package is installed.
So nothing updates "basic" network configuration files in the target environment if you reconfigure the network after installing the base system. It does not affect only the target system after the installation, it may also affect the ability to use a mirror in "Configure the package manager" and "Select and install software" if the the original DNS configuration is wrong.
Maybe a possible option would be to copy "basic" network configuration files to the target system if "Configure the network" is re-run after "Install the base system" ? In rescue mode, the target system is mounted only when in "Enter rescue mode" so it should be fine. Not sure about live-installer though.