Comment 9 for bug 2028889

Tested with virt-install --disk ./mantic-install.img,size=10:

"Not enough disk space to install Ubuntu

Required: 14.03GB
Available: 10.74GB"

--disk ./mantic-install.img,size=13:

"Not enough disk space to install Ubuntu

Required: 14.03GB
Available: 13.96GB"

--disk ./mantic-install.img,size=13: both the classic option and the TPM option are available. The classic option is selected by default.

It is impossible to say from the UX whether this is fixed because of improved logic in u-d-i, or because the calculated size requirements for the TPM install option have increased to the point that this situation no longer occurs.