Using your test.img in trusty, I see:
serge@sergelap:~$ qemu-img info test.img.1
image: test.img.1
file format: qcow2
virtual size: 1.0G (1073741824 bytes)
disk size: 196K
cluster_size: 65536
Format specific information:
compat: 1.1
lazy refcounts: false
Are you sure you copied the right image from your 14.04
box?
status: incomplete
** Changed in: qemu (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1282655
Title:
qcow2 images are not backwards compatiable with 12.04's qcow2
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