package firefox-3.5 3.5+nobinonly-0ubuntu1 failed to install/upgrade: el subproceso installed post-installation script devolvió el código de salida de error 2

The problem may be that Konqueror is corrupting x-www-browser alternative when it is installed or updated:

$ sudo dpkg --configure -a
Setting up konqueror (4:4.2.98-0ubuntu1) ...
update-alternatives: error: /var/lib/dpkg/alternatives/x-www-browser corrupt: invalid status
dpkg: error processing konqueror (--configure):
 subprocess installed post-installation script returned error exit status 2
Errors were encountered while processing:
 konqueror

This cause problems at setting up both: Koqueror and Firefox.
I attach the corrupted x-www-browser file.

Konqueror isn't the part of the alternatives file that is corrupted. It appears that the status is. Here's my alternatives file:

auto
/usr/bin/x-www-browser

/usr/bin/firefox-3.0
40
/usr/bin/firefox-3.5
40
/usr/bin/konqueror
100

Have you tried upgrading to Firefox 3.5.1 yet?

We'd really like to help you figure this out. Could you please try Firefox 3.5.2 to see if you are still having this issue?
Thanks.

I think the problem may be in kalternatives package, alternatives configuration files edited with kalternatives (karmic), are considered as corrupted by dpkg. Then if I edit x-www-broser with kalternatives, it results broken for dpkg and it later fails to install or upgrade any web browser that need to be added in x-www-browser as like as konqueror or firefox.

Still a problem in recent versions?