This is actually from Lorax, but the package is the same at
the present time (pdksh-5.2.14-1).
PS1 is set to be [\u@\h \W] but ksh isn't interpreting them
as special sequences and leaving that verbatim as the
prompt. This is due to the fact that ksh reads /etc/profile
as it's startup file as well as bash and the two don't share
This will be fixed in setup-2.1.6, as the prompt will be set in /etc/bashrc.