Wubi re-downloads ISO when started from USB stick

[Alan Pope 🍺🐧🐱 🦄]

I used the USB creator tool made by Evan Dandrea to turn an Ubuntu ISO image (64-bit, desktop) into a bootable USB stick.

The user inserted this stick into a running Vista system and ran wubi.exe. Wubi didn't seem to realise that the CDROM 'image' was on the USB stick and started downloading the ISO.

Would it be possible to make it so that wubi can detect the presence of the USB key containing the live CD and use that rather than re-download the ISO?

[Thomas Detoux (detoux)]

I confirm this bug, this is really frustrating when you even don't have an internet connection.

[probono (probono)]

Not a liveusb bug

[Agostino Russo (ago)]

Since USB-creator extracts the files from the ISO, this bug is blocked by #243105. I didn't have a chance to test whether #243105 has been fixed, but it seems unlikely.

[bcbc (bcbc)]

When wubi copies the ISO from the USB it copies the entire partition. If your USB has a single 4GB partition it will copy 4GB onto the hard drive as installation.iso. Then if checks the size against 900000 bytes and fails it. Then it tries to download another.

If the USB partition is < 900000 bytes I assume it would work ok (haven't personally tested this). But the ISO copy shouldn't be allowed to copy something larger than this - as there is a potential to run out of space on the hard drive (USB sticks can be very large these days).