UCS 2.4 - Univention

3 Installation
3.3 Hardware-related Installation problems
In case any hardware-related problems occur during installation, these can usually be circumvented by
additional kernel parameters or by adjusting the automatic hardware detection.
3.3.1 Starting the Installation with additional kernel parameters
To start the installation with additional kernel parameters, select the desired installation procedure at the
boot prompt (cf. Illustration 3.1 on page 26) by using the arrow keys.
Press the ’e’ key for having the configuration lines of the boot loader displayed for the selected installation
procedure. The uppermost line, which begins with kernel, will be selected. After pressing the ’e’ key once
again, the list of boot parameters can be adjusted. Additional kernel parameters have to be added at the
end of each line. Where several parameters are to be added, these must be separated by blanks.
The input is confirmed by pressing the Return key. Pressing the ’b’ key causes the computer to boot
with the changed boot parameters. After successful installation, the UCS Installer automatically transfers
the additional parameters to the Univention Configuration Registry variable grub/append so that the
parameters will be considered during future boot procedures.
3.3.2 Additional kernel parameters
Some graphic cards do not support the VESA standard for frame buffers which is necessary for represent-
ing bootsplash graphics. On such systems, the use of the frame buffer can be suppressed by the kernel
parameter
video=vga16:off
However, this parameter is not permanently adopted into the boot configuration.
When using older hardware, problems might occur when using the ’Advanced Configuration and Power
Interface’ (ACPI). In such cases, the use of ACPI should be disabled via the kernel parameter
acpi=off
3.3.3 Adjusting the automatic hardware detection
During start-up, the UCS Installer executes an automatic hardware detection. If during the automatic
hardware detection a system crash or hardware trouble should occur, the automatic hardware detection
can be disabled via the additional boot parameter noprobe.
As standard the Univention Installer uses udev for device management. To deactivate automatic hardware
detection udev must also be disabled with the boot parameter noudev.
The boot parameter is interpreted exclusively by the UCS Installer; it is to be declared at the boot prompt
in the same way as an additional kernel parameter. It should be noted, that for a successful installation, all
38