After upgraded to Ubuntu 9.10, I could not update any wordpress plugins any more. It worked fine with early Ubuntu releases. After a quick check on the web, it was  a bug in the Ubuntu release. Missing zlib Extension


Ubuntu has not put the code into the final updated yet.  You need to add karmic-proposed into your apt source file.

Here are the two lines you need to add to your apt source:

>sudo nano /etc/apt/sources.list

deb karmic-proposed main restricted  universe multiverse
deb-src karmic-proposed main restricted  universe multiverse

Modify the Apt sources.list

After saving the file, run the following commands:

  1. sudo aptitude update
  2. sudo apt-get update
  3. sudo apt-get upgrade

After the above steps, wordpress has no problems to update plugins.

Successful Plugin UpgradeReference

  1. Ubuntu Bug Report 451405
  2. Fixing Missing zlib Extensions