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I downloaded the boot and updates disks for the RH 6.1 installer, booted with these disks, and chose to upgrade my existing system. The installer said that I have no Linux partitions and would let me go no further. Here is how my partitions are set up: /dev/hda1: FAT16 /dev/hda2: Win95 Extended /dev/hda5: Win95 FAT32 /dev/hda6: Linux (/boot) /dev/hda7: Linux (/) /dev/hda8: Linux swap I'm not sure how I got the extended partition. It might have happened when I shrunk the FAT32 parition with PartitionMagic, before installing Red Hat 6.0. Anyway, my guess is that the installer can't find my Linux partition because it's in an extended partition.
My guess is that your extended partition is of type "f" and this is why you are having problems. There is a known bug in the installer which prevents it from seeing into type "f" partitions. The workaround is to change the partition from type "f" to type "5" for the duration of the upgrade and then change it back. The other option is that you can wait until we release the next round of updates (should not be too long) which will fix this problem. Please reopen is this is not the problem you are seeing and we will collect more information from you.