Currently, install requres a Linux swap partition to exist
before the install can proceed. Ironically, a subsequent
screen permits you to not use a swap partition and continue.
On today's large memory systems, it should be permitted to
install and run Linux without a swap partition at all.
Current workaround: make a 1 MB (or single-cylinder) swap
Performing the installation in "expert" mode will allow you to get
around this requirement. This is not a bug in the system, but rather
a safety feature.