If you successfully managed an installation with debian-installer, please take time to provide us with a report. The simplest way to do so is to install the reportbug package (apt install reportbug), configure reportbug as explained in Del 8.4.2, «Sending E-Mails Outside The System», and run reportbug installation-reports.

If you did not complete the install, you probably found a bug in debian-installer. To improve the installer it is necessary that we know about them, so please take the time to report them. You can use an installation report to report problems; if the install completely fails, see Del 5.4.6, «Reporting Installation Problems».