Comment 3 for bug 1347345

my guess is that 4764 is insufficient for successful lubuntu installation from desktop image. During installation, we use a bit more space and then clean-up and remove things in the end. Thus whilst minimal install size is the same, during installation we need a bit more.

Can you please file the bug report with $ ubuntu-bug ubiquity, from that live session of the failed installation?

Otherwise please attach:
* syslog
* partman log
* /var/log/installer