You can take a look in var/log/error.log to see what the detail was, or enable debugOutput in settings/site.ini (after installation, settings should be overridden in for instance settings/override/site.ini.append.php so settings are not lost when you update eZ Publish later) to get it on screen. It's normally a database connection error.
[ Aug 31 2009 18:18:37 ] Unexpected error, the message was : The checksum of the file 'compress.zlib://var/cache/packages/ezwebin_site.ezpkg' is invalid. in /home/user/public_html/lib/ezc/Archive/src/tar/headers/tar_v7.php on line 198
I managed to get around this issue simply by temporary removing the checksum control from /lib/ezc/Archive/src/tar/headers/tar_v7.php (line 198). eZ Publish is running fine now, though I don't know what happens if I add additional packages.
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