Kubuntu: "The APT database could not be opened"

[^rooker]

[PROBLEM]
While upgrading Kubuntu Dapper to Edgy, the update ran into some error (some libqt stuff) and afterwards I got this error:

The APT Database could not be opened! This may be caused by incorrect APT configuration or some similar problem. Try running apt-setup and apt-get update in terminal and see if it helps to resolve the problem.

...although apt-get from the commandline still works.

[SOLUTION]
Thanks to this forum entry

I found that executing this line fixes it:

Code: Select all

sudo debtags update