Looking at the logs I get this error
Code: Select all
File Error: ubuntu-15.04-desktop-amd64.iso file (/path/to/file/complete/ubuntu-15.04-desktop-amd64.iso.!qB) error: File too large
EDIT: I tried unchecking pre-allocate disk space and it now works fine. Now the question is why can I not pre-allocate disk space, which I can do with deluge.