Chapter 5. Booting the Installation System DEBIAN_FRONTEND BOOT_DEBUG INSTALL_MEDIA_DEV This boot parameter controls the type of user interface used for the installer. The current possible parameter settings are: The default frontend is DEBIAN_FRONTEND=newt . DEBIAN_FRONTEND=text may be prefer- able for serial console installs . Some specialized types of install media may only offer a limited selection of frontends, but the newt and text frontends are available on most default install media. On architectures that support it, the graphical installer uses the gtk frontend. Setting this boot parameter to 2 will cause the installer’s boot process to be verbosely logged. Setting it to 3 makes debug shells available at strategic points in the boot process. (Exit the shells to continue the boot process.) BOOT_DEBUG=0 BOOT_DEBUG=1 BOOT_DEBUG=2 BOOT_DEBUG=3 lowmem The value of the parameter is the path to the device to load the Ubuntu installer from. For exam- ple, Shells are run at various points in the boot process to allow detailed debugging. Exit the shell to continue the boot. Lots of debugging information. More verbose than usual. This is the default. Causes the installer to send log messages to a remote syslog on the specified host and port as well as to a local file. If not specified, the port defaults to the standard syslog port 514. Can be used to force the installer to a lowmem level higher than the one the installer sets by default based on available memory. Possible values are 1 and 2. See also Section 6.3.1.1. 36 • DEBIAN_FRONTEND=noninteractive • DEBIAN_FRONTEND=text • DEBIAN_FRONTEND=newt • DEBIAN_FRONTEND=gtk log_host log_port