It's an odd issue, i installed Ubuntu 11.04 trough Wubi yesterday,it actually worked unlike the last time i tried to when it didn't boot at all.
But there is one thing that bugs me, see, i have 2 HDD's ,a 320GB one with Windows 7, and the other, a 500GB HDD with Ubuntu 10.10.
I have partitioned the 500GB HDD, and contains a NTFS partition, and a EXT4 plus the Swap partitions.
The 320GB is not partitioned, as it only has Windows 7.
Since i installed Wubi on Windows 7, when i have my Ubuntu drive connected, Wubi won't boot the installation, giving me a "no wubdir" error.
However, if i phisically unplug the Ubuntu drive, then Wubi boots just fine.
So, how is the Ubuntu drive interfering with Wubi, to the extent of Wubi not even working when the drive is plugged?.
Wubi uses grub4dos to boot (wubildr.mbr). The version of grub4dos is from around 2007 which is before ext4 was released. In any event, wubildr.mbr will hang whenever it encounters an ext4 partition.
The way it works is to search each partition (in BIOS order) for the file /wubildr (i.e. wubildr in the root of the partition). If it gets to the ext4 partition before it finds /wubildr, it will hang. So the solution is to copy /wubildr from your 320GB drive to the ntfs partitions on the 500GB drive, assuming it falls before the ext4 one - if not, the only way would be to add an entry to your other Ubuntu so that you can boot the Wubi install from there.
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