The Ubuntu installer supports several front-ends for asking questions, with varying convenience for accessibility: notably, text uses plain text while newt uses text-based dialog boxes. The choice can be made at the boot prompt, see the documentation for DEBIAN_FRONTEND in Section 5.3.2, “Ubuntu Installer Parameters”.

Some accessibility devices are actual boards that are plugged inside the machine and that read text directly from the video memory. To get them to work framebuffer support must be disabled by using the fb=false boot parameter. This will however reduce the number of available languages.

For users with low vision, the installer can use a high-contrast color theme that makes it more readable. To enable it, append the theme=dark boot parameter.

For users with low vision, the graphical installer has a very basic zoom support: the Control++ and Control+- shortcuts increase and decrease the font size.

Alternatively, Ubuntu can be installed completely automatically by using preseeding. This is documented in Appendix B, Automating the installation using preseeding.

Documentation on accessibility of the installed system is available on the Debian Accessibility wiki page.