Calculation of upgrade failed

[Simon Hausmann]

kubuntu-devel-release-upgrade fails with the "Could not calculate the upgrade" message dialog, referring to an unresolvale problem while calculating the upgrade.

A manual apt-get dist-upgrade on the terminal suggests that the following conflict might be the reason perhaps?

Calculating upgrade... Failed
The following packages have unmet dependencies:
 tk : Breaks: tk8.5 (< 8.5.14-3) but 8.5.11-2ubuntu4 is to be installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

That said, aptitude seems to be able to determine an upgrade path.

[Simon Hausmann (shausman)]

Attached the dist-upgrade apt.log that confirms that the issue seems to be around the tk package