select manual partitioning dude-then,
For eg: after /dev/sda7 in
Mount point add a "
/" without quote.now make a swap partn of 500MB or lesser and select as
Type- swap
^see-u need to give the "/" there- partn where u going to install ubuntu
.that error is that u need to specify it as the root or "/" where ur ubuntu is gonna be installed.below links are useful for u.but read that after u completes the ubuntu install.hrmm...
http://linux.oneandoneis2.org/starting.htm
http://linux.oneandoneis2.org/LNW.htm