Comment 90 for bug 580961

I just tried frol's PPA with the libnatspec dependency.
It didn't correctly autodetect the encoding so I didn't see any benefit with that implementation.
It did however work as good as unzip did in older Ubuntu versions, i.e. both extracting *and listing* worked if either the UNZIP/ZIPINFO environment variables were defined, or if the -O parameter was used:

# autodetection doesn't work:
$ echo $LANG
el_GR.utf8
$ unzip -l biografiko.zip
    43008 2010-05-14 12:20 biografiko/Ä¢₧Ü圪 ⌐¼úºóπ¿α⌐₧¬ ÿσ½₧⌐₧¬_Ö.doc

# works with the UNZIP environment variable:
$ UNZIP='-O cp737' unzip -l biografiko.zip
    43008 2010-05-14 12:20 biografiko/Οδηγίες συμπλήρωσης αίτησης_β.doc
# (alternatively, the same output is also produced with "-O cp737" in the command line)

# and in zipinfo mode, as called by file-roller:
$ ZIPINFO='-O cp737' unzip -ZTs biografiko.zip
-rw-a-- 2.0 fat 43008 b- defN 20100514.122016 biografiko/Οδηγίες συμπλήρωσης αίτησης_β.doc
# (alternatively, the same output is also produced with "-O cp737" in the command line)

So, it looks like only half of the required patch was included in unzip 6.0-4ubuntu1.
Please make listing (unzip -l and unzip -ZTs) work, as it did in previous Ubuntu versions.