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installed 7.2.0 persistent (unencrypted) to 8GB USB key on 32-bit system.

Booted from key, did apt-get update && apt-get upgrade

Upgrade fails with:
Preparing to replace libc6:i386...

The sha1sum result from the torrent iso matches the one for the iso generated from Linux Pro Magazine: 08a031b548cba80fa83a12ab803661799a15900c. They both fail bootable self-test, however.