Since upgrading from Ubuntu 10.04 to 12.04 I noticed restore has been suggesting it cannot restore all the files intended to be captured by dump.
I am seeing output from restore along the lines of
restore: ./tigi/.cache/dconf/user: ftruncate: Invalid argument
I took the dump using an LVM2 snapshot and restored against the same snapshot 3 minutes later.
Linux yoda 3.2.0-25-generic-pae #40-Ubuntu SMP Wed May 23 22:11:24 UTC 2012 i686 i686 i386 GNU/Linux