I was trying to install CB 204 on my J!336 site running on Ubuntu 14.04 server and I got this error:
Unknown or missing compression type (gz)
Error happened in libraries/CBLib/CB/Legacy/Archive_Tar.php while unpacking plugins tgz archive.
Turned out zlib library used on Ubuntu does not have gzopen, while gzopen 64 should be used.
I changed all occurencies of gzopen to gzopen64 and rest went fine
The following user(s) said Thank You: beat, Gunner10
You should also report "It affects me too", and comment that Community Builder is also affected by this bug.
CB 2.0.4 has the workaround for that known Ubuntu 14.04 PHP bug in in the PclZip library, but not in the TarGz library. Adding tracker item to fix it in a future release:
forge.joomlapolis.com/issues/4950