After a recent update on Ubuntu I found that I was unable to use ssh due to a strange permissions error to do with the ssh config file. This was quite a problem as I wasn't able to push changes to my git server. The error was as follows:

Phing allows the running of SSH commands on servers and the copying of files to servers via SCP. Before you can use SSH and SCP commands in Phing you need to install the PECL extension SSH2. The SSH2 PECL extension requires the libssh2 package, so you need to install that before you can get started. The following install instructions are based on a Linux environment.

Download the libssh2 package from www.libssh2.org and install it by using the following commands. Your package version may vary.