Find a bug?
See this page on reporting bugs for help. Not sure which package to file against? See Finding the right package and the chart below for help. Unsure how to report a bug from a vm or non-connected machine? See this page.
For problems encountered ... ... during the installation itself: ubuntu-bug ubiquity ... while booting the ISO image: ubuntu-bug syslinux ... while booting the system after installation: ubuntu-bug grub2 ... with the graphical display after installation: ubuntu-bug xorg ... with an application: ubuntu-bug PACKAGE_NAME