Comment 1 for bug 339550

lsb_release -rd
Description: Ubuntu jaunty (development branch)
Release: 9.04

the dependancy is also (?) unmet if both 2.5 and 2.6 versions of python are installed

$ LANG=C sudo apt-get install pida; LANG=C dpkg --list python2.[456]
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
  pida: Depends: python (< 2.6) but 2.6.1-0ubuntu3 is to be installed
E: Broken packages
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Cfg-files/Unpacked/Failed-cfg/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Name Version Description
+++-=============================-=============================-==========================================================================
ii python2.5 2.5.4-1ubuntu2 An interactive high-level object-oriented language (version 2.5)
ii python2.6 2.6.1-1ubuntu1 An interactive high-level object-oriented language (version 2.6)