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I upgraded both my desktop and server to Ubuntu 9.10 Karmic Koala from 9.04 last week. Today I came across an error uploading a zip file to be extracted using PHP:

Abort pclzip.lib.php : Missing zlib extensions

After some searching around (remember, in cases such as this, Google is your friend), I found a link to an ongoing discussion regarding this issue.  Bottom line, there is a fix in the pipe to be released, but it’s still in “proposed” status.  To get it you need to edit your sources list:

sudo vim /etc/apt/sources.list

Once you’ve opened the file, add the following two lines:

deb http://security.ubuntu.com/ubuntu karmic-proposed main restricted universe multiverse
deb-src http://security.ubuntu.com/ubuntu karmic-proposed main restricted universe multiverse

Save the file, then execute:

sudo aptitude update

Once you’ve done this, go to System->Administration->Update Manager, run the update, and viola, no more zlib error!