Hello again, I forgot to mention that I'm not subscribed so please CC: me personally in all replies.
I know that installation on extended partitions is not officially supported, that's why I'm asking for "unofficial" information. If I could choose I would of course had tried installation on a primary partition, but I had no alternative. I would either try installing it there, or not at all. After all, I have read at various places about it being unsupported but doable (with no details anywhere, unfortunately). For example I quote the following: flag Make the given partition table entry bootable. Only one entry can be marked bootable. If you wish to boot from an extended partition, you will need to mark the partition table entry for the extended partition as bootable. from http://www.openbsd.org/faq/faq14.html#fdisk Thanks, Dimitris