Sometimes, especially with older drives, the installer may fail to boot from an optical disc. The installer may also — even after booting successfully from such disc — fail to recognize the disc or return errors while reading from it during the installation. There are many different possible causes for these problems. We can only list some common issues and provide general suggestions on how to deal with them. The rest is up to you. There are two very simple things that you should try first. If the disc does not boot, check that it was inserted correctly and that it is not dirty. If the installer fails to recognize the disc, try just running the option Detect and mount installation media a second time. Some DMA related issues with very old CD-ROM drives are known to be resolved in this way. If this does not work, then try the suggestions in the subsections below. Most, but not all, suggestions discussed there are valid for CD-ROM and DVD. If you cannot get the installation working from optical disc, try one of the other installation methods that are available. Some older CD-ROM drives do not support reading from discs that were burned at high speeds using a modern CD writer. Some very old CD-ROM drives do not work correctly if direct memory access (DMA) is enabled for them. If the optical disc fails to boot, try the suggestions listed below. Check that your BIOS actually supports booting from optical disc (only an issue for very old systems) and that booting from such media is enabled in the BIOS. If you downloaded an iso image, check that the md5sum of that image matches the one listed for the image in the MD5SUMS file that should be present in the same location as where you downloaded the image from. $ md5sum debian-testing-i386-netinst.iso a20391b12f7ff22ef705cee4059c6b92 debian-testing-i386-netinst.iso Next, check that the md5sum of the burned disc matches as well. The following command should work. It uses the size of the image to read the correct number of bytes from the disc. $ dd if=/dev/cdrom | \ > head -c `stat --format=%s debian-testing-i386-netinst.iso` | \ > md5sum a20391b12f7ff22ef705cee4059c6b92 - 262668+0 records in 262668+0 records out 134486016 bytes (134 MB) copied, 97.474 seconds, 1.4 MB/s If, after the installer has been booted successfully, the disc is not detected, sometimes simply trying again may solve the problem. If you have more than one optical drive, try changing the disc to the other drive. If that does not work or if the disc is recognized but there are errors when reading from it, try the suggestions listed below. Some basic knowledge of &arch-kernel; is required for this. To execute any of the commands, you should first switch to the second virtual console (VT2) and activate the shell there. Switch to VT4 or view the contents of /var/log/syslog (use nano as editor) to check for any specific error messages. After that, also check the output of dmesg. Check in the output of dmesg if your optical drive was recognized. You should see something like (the lines do not necessarily have to be consecutive): ata1.00: ATAPI: MATSHITADVD-RAM UJ-822S, 1.61, max UDMA/33 ata1.00: configured for UDMA/33 scsi 0:0:0:0: CD-ROM MATSHITA DVD-RAM UJ-822S 1.61 PQ: 0 ANSI: 5 sr0: scsi3-mmc drive: 24x/24x writer dvd-ram cd/rw xa/form2 cdda tray cdrom: Uniform CD-ROM driver Revision: 3.20 If you don't see something like that, chances are the controller your drive is connected to was not recognized or may be not supported at all. If you know what driver is needed for the controller, you can try loading it manually using modprobe. Check that there is a device node for your optical drive under /dev/. In the example above, this would be /dev/sr0. There should also be a /dev/cdrom. Use the mount command to check if the optical disc is already mounted; if not, try mounting it manually: $ mount /dev/hdc /cdrom Check if there are any error messages after that command. Check if DMA is currently enabled: $ cd /proc/ide/hdc $ grep using_dma settings using_dma 1 0 1 rw A 1 in the first column after using_dma means it is enabled. If it is, try disabling it: $ echo -n "using_dma:0" >settings Make sure that you are in the directory for the device that corresponds to your optical drive. If there are any problems during the installation, try checking the integrity of the installation media using the option near the bottom of the installer's main menu. This option can also be used as a general test if the disc can be read reliably. If you have problems and the kernel hangs during the boot process, doesn't recognize peripherals you actually have, or drives are not recognized properly, the first thing to check is the boot parameters, as discussed in . In some cases, malfunctions can be caused by missing device firmware (see and ). If software speech synthesis does not work, there is most probably an issue with your sound board, usually because either the driver for it is not included in the installer, or because it has unusual mixer level names which are set to muted by default. You should thus submit a bug report which includes the output of the following commands, run on the same machine from a Linux system which is known to have sound working (e.g., a live CD). dmesg lspci lsmod amixer There are some common installation problems that can be solved or avoided by passing certain boot parameters to the installer. If your screen begins to show a weird picture while the kernel boots, eg. pure white, pure black or colored pixel garbage, your system may contain a problematic video card which does not switch to the framebuffer mode properly. Then you can use the boot parameter fb=false to disable the framebuffer console. Only a reduced set of languages will be available during the installation due to limited console features. See for details. Some very old laptop models produced by Dell are known to crash when PCMCIA device detection tries to access some hardware addresses. Other laptops may display similar problems. If you experience such a problem and you don't need PCMCIA support during the installation, you can disable PCMCIA using the hw-detect/start_pcmcia=false boot parameter. You can then configure PCMCIA after the installation is completed and exclude the resource range causing the problems. Alternatively, you can boot the installer in expert mode. You will then be asked to enter the resource range options your hardware needs. For example, if you have one of the Dell laptops mentioned above, you should enter exclude port 0x800-0x8ff here. There is also a list of some common resource range options in the System resource settings section of the PCMCIA HOWTO. Note that you have to omit the commas, if any, when you enter this value in the installer. There are some common installation problems that are worth mentioning. It is fairly common for &arch-title; to have two video cards in one machine, for example an ATI card and a Sun Creator 3D. In some cases, this may result in the video output getting misdirected soon after the system boots. In typical cases, the display will only show: Remapping the kernel... done Booting Linux... To work around this, you can either pull out one of the video cards, or disable the one not used during the OpenProm boot phase using a kernel parameter. For example, to disable an ATI card, you should boot the installer with video=atyfb:off. Note that you may also have to manually add this parameter to the silo configuration (edit /target/etc/silo.conf before rebooting) and, if you installed X11, modify the video driver in /etc/X11/xorg.conf. Some Sparc systems are notoriously difficult to boot from CD-ROM and even if they do boot, there may be inexplicable failures during the installation. Most problems have been reported with SunBlade systems. We recommend to install such systems by netbooting the installer. During the boot sequence, you may see many messages in the form can't find something, or something not present, can't initialize something, or even this driver release depends on something. Most of these messages are harmless. You see them because the kernel for the installation system is built to run on computers with many different peripheral devices. Obviously, no one computer will have every possible peripheral device, so the operating system may emit a few complaints while it looks for peripherals you don't own. You may also see the system pause for a while. This happens when it is waiting for a device to respond, and that device is not present on your system. If you find the time it takes to boot the system unacceptably long, you can create a custom kernel later (see ). If you get through the initial boot phase but cannot complete the install, the menu option Save debug logs may be helpful. It lets you store system error logs and configuration information from the installer on a storage medium, or download them using a web browser. This information may provide clues as to what went wrong and how to fix it. If you are submitting a bug report, you may want to attach this information to the bug report. Other pertinent installation messages may be found in /var/log/ during the installation, and /var/log/installer/ after the computer has been booted into the installed system. If you still have problems, please submit an installation report. We also encourage installation reports to be sent even if the installation is successful, so that we can get as much information as possible on the largest number of hardware configurations. Note that your installation report will be published in the Debian Bug Tracking System (BTS) and forwarded to a public mailing list. Make sure that you use an e-mail address that you do not mind being made public. If you have a working &debian; system, the easiest way to send an installation report is to install the installation-report and reportbug packages (apt install installation-report reportbug), configure reportbug as explained in , and run the command reportbug installation-reports. Alternatively you can use this template when filling out installation reports, and file the report as a bug report against the installation-reports pseudo package, by sending it to submit@bugs.debian.org. Package: installation-reports Boot method: <How did you boot the installer? CD/DVD? USB stick? Network?> Image version: <Full URL to image you downloaded is best> Date: <Date and time of the install> Machine: <Description of machine (eg, IBM Thinkpad R32)> Processor: Memory: Partitions: <df -Tl will do; the raw partition table is preferred> Output of lspci -knn (or lspci -nn): Base System Installation Checklist: [O] = OK, [E] = Error (please elaborate below), [ ] = didn't try it Initial boot: [ ] Detect network card: [ ] Configure network: [ ] Detect media: [ ] Load installer modules: [ ] Detect hard drives: [ ] Partition hard drives: [ ] Install base system: [ ] Clock/timezone setup: [ ] User/password setup: [ ] Install tasks: [ ] Install boot loader: [ ] Overall install: [ ] Comments/Problems: <Description of the install, in prose, and any thoughts, comments and ideas you had during the initial install.> In the bug report, describe what the problem is, including the last visible kernel messages in the event of a kernel hang. Describe the steps that you did which brought the system into the problem state.