check and restore fails on the alternate variant of clonezilla live because "lrzcat" seems to be missing from the image.
I looked a bit further into it - this _might_ be because the version on the ubuntu images (debian images work fine out of the box) have only version 602 of lrzip - the changelog says (for 605):
MAY 2011, version 0.605 Con Kolivas
* Addition of explicit lrzcat symlink which automatically sets "-d -o -"
* Revert automatic output to stdout due to addition of explicit lrzcat
executable, and to be consistent with gzip.
so lrzcat might not exist because the version is too old on the ubuntu image.
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Thanks for the bug report.
I confirmed this issue on Clonezilla live Oneiric based version. While Precised-based Clonezilla live does not have such issue.
Fixed in clonezilla-live-20120220-oneiric.
If any issue, please reopen it.