Yes, it is a wubi installation in the bigger disk (/dev/sdb). 
In the other disk there is an older version of ubuntu (two or three yeasrs old)
Not sure about the /boot filesystem question.
Below is the info from fdisk
Thanks

drwxr-xr-x   3 root root 32768 2008-11-28 18:59 boot
dr-xr-xr-x 122 root root     0 2008-12-01 11:05 proc
drwxr-xr-x  12 root root     0 2008-12-01 11:05 sys
drwxr-xr-x   4 root root  4096 2008-12-01 18:06 media
drwxr-xr-x  14 root root 14280 2008-12-01 18:06 dev
drwxr-xr-x 126 root root 12288 2008-12-01 18:07 etc
drwxrwxrwt  12 root root  4096 2008-12-01 19:32 tmp
root@ubuntu:/# fdisk -l

Disk /dev/sda: 15.0 GB, 15020457984 bytes
255 heads, 63 sectors/track, 1826 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000a79ce

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1         638     5124703+   b  W95 FAT32
/dev/sda2             639        1826     9542610    f  W95 Ext'd (LBA)
/dev/sda5             639         640       16033+  83  Linux
/dev/sda6             641         657      136521   82  Linux swap / Solaris
/dev/sda7             658        1276     4972086   83  Linux
/dev/sda8            1277        1826     4417843+   b  W95 FAT32

Disk /dev/sdb: 40.9 GB, 40982151168 bytes
255 heads, 63 sectors/track, 4982 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x3957804f

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *           1        4982    40017883+   c  W95 FAT32 (LBA)
root@ubuntu:/# 



--- On Sun, 11/30/08, Jean-Baptiste Lallement <email address hidden> wrote:

> From: Jean-Baptiste Lallement <email address hidden>
> Subject: [Bug 300843] Re: package linux-image-2.6.27-7-generic 2.6.27-7.15 failed to install/upgrade: unable to make backup link of `./boot/vmlinuz-2.6.27-7-generic' before installing new version: Operation not permitted
> To: <email address hidden>
> Date: Sunday, November 30, 2008, 7:57 PM
> Thanks for your report.
> 
> Is this a wubi installation and what is the filesystem type
> of /boot ?
> 
> ** Changed in: linux (Ubuntu)
>        Status: New => Incomplete
> 
> -- 
> package linux-image-2.6.27-7-generic 2.6.27-7.15 failed to
> install/upgrade: unable to make backup link of
> `./boot/vmlinuz-2.6.27-7-generic' before installing new
> version: Operation not permitted
> https://bugs.launchpad.net/bugs/300843
> You received this bug notification because you are a direct
> subscriber
> of the bug.
> 
> Status in “linux” source package in Ubuntu: Incomplete
> 
> Bug description:
> Using Latest copy of Ibex, however this update also crashed
> on previous linux OS Hardy Heron.
> 
> ProblemType: Package
> Architecture: i386
> DistroRelease: Ubuntu 8.10
> ErrorMessage: unable to make backup link of
> `./boot/vmlinuz-2.6.27-7-generic' before installing new
> version: Operation not permitted
> Package: linux-image-2.6.27-7-generic 2.6.27-7.15
> ProcCmdLine: User Name=UUID=4685-9D93
> loop=/ubuntu/disks/home/username.disk ro quiet splash
> ProcVersionSignature: Ubuntu 2.6.27-7.15-generic
> SourcePackage: linux
> Title: package linux-image-2.6.27-7-generic 2.6.27-7.15
> failed to install/upgrade: unable to make backup link of
> `./boot/vmlinuz-2.6.27-7-generic' before installing new
> version: Operation not permitted
> 
> P.S: I've installed Ubuntu through windows xp "as
> a windows application"