Where is this Ubuntu documentation you found that told you to do it this way?
Operating the partitioner with a loop-mounted ISO image is very delicate, which is why I don't normally recommend it. It *ought* to work as long as you set up all the partition tables in advance, though, so I'll investigate this and see what's going wrong. It would speed up our investigations considerably if you could attach the installer's log files (/var/log/syslog and /var/log/partman).
I hope you filed bugs about the partitioning problems you had earlier!
Where is this Ubuntu documentation you found that told you to do it this way?
Operating the partitioner with a loop-mounted ISO image is very delicate, which is why I don't normally recommend it. It *ought* to work as long as you set up all the partition tables in advance, though, so I'll investigate this and see what's going wrong. It would speed up our investigations considerably if you could attach the installer's log files (/var/log/syslog and /var/log/partman).
I hope you filed bugs about the partitioning problems you had earlier!