ps2pdf messes up the paper margins when you run it on a A4 landscape postscript file, because it assumes letter sized paper per default.
To fix this, you can either fiddle around in the shell scripts itself or RTFM and invoke the command correctly:
$ ps2pdf -sPAPERSIZE=a4 myfile.ps myfile.pdf
This rather cryptic error may appear during a Fedora 16 installation and simply tries to tell you, that you forgot to create a BIOS boot partition.
If you’re doing a kickstart install, a look at Fedora’s Kickstart wiki page may be helpful. A big yellow alert box essentially tells you to add the following line
part biosboot --fstype=biosboot --size=1
to your kickstart file that used to work with Fedora versions <= 15.
Fedora 16 common bugs