This is a problem of confusing a block device (/dev/sda2) with a file system. In order to look at the filesystem that lives on /dev/sda2, you will need to mount
it somewhere within your existing filesystem. The conventional place to mount stuff (at least temporarily) is /mnt
. Whatever is in the /mnt folder will be hidden when you mount a new filesystem there, so you might want to create a new directory, say
/mnt/tmp, and then mount the OpenSUSE filesystem on your Ubuntu system.
Very probably, after you have created the directory /mnt/tmp, the command
# mount /dev/sda2 /mnt/tmp
will do the trick, because the mount command tries its best to figure out what you want. But it might not be able to figure out what kind of filesystem you are asking for; in that case, Read The Fine Manpage