How can I tell if I installed with wubi?

Solution 1:

Wubi will show two boot managers. First the Windows one, then GRUB. Plain Ubuntu just GRUB.

Under Ubuntu there is also a /host folder, that will link to the drive where you installed the WUBI image.

Solution 2:

Unless it's changed since I last tried Wubi, if you installed via Wubi, if you check 'Programs and Features' in Control Panel in Windows 7 you will see Ubuntu (or Wubi?) listed as a program in the add/remove programs list like all of your other programs.

Solution 3:

From Windows

You should have a C:\ubuntu\disks folder and into this a file root.disk.
The drive is not necessarily the C:, look for it in every volume known to Windows.

From Ubuntu

The command mount | grep ^/dev should return an output similar to

/dev/loop0 on / type ext4 (rw,errors=remount-ro,commit=0)
/dev/sda2 on /host type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)

In particular a loop device mounted on the root partition (the /), and a real partition mounted on /host.