dpkg: error processing icedtea-gcjwebplugin

I see the same error on my Installation (Hardy) using Firefox 3B-05

Same error for me. Hardy Heron, Firefox 3 b5

I have the same configuration and I can replicate the error with the package icedtea-gcjwebplugin, version "1.0-ubuntu6 (hardy-proposed)"
This error is shown any time the subprocess post-installation script runs (~ for any other package installed/removed).
It disappears removing the package or installing other versions.

I think this line of the error message shows the problem source:
update-alternatives: unable to make /usr/lib/midbrowser/plugins/libjavaplugin.so.dpkg-tmp a symlink to /etc/alternatives/midbrowser-javaplugin.so: No such file or directory

Infact, the directory /usr/lib/midbrowser/ does not exist, and the same is true for the file "midbrowser-javaplugin.so"
I don't know the correct path, nor the correct alternative to set.
It seems there's a problem in the way the package has been made; I think anyone could see the same error installing the version "1.0-ubuntu6 (hardy-proposed)".

If you need this package, you should try this workaround: downgrade icedtea-gcjwebplugin to version "1.0-ubuntu5 (hardy)".
To downgrade, you have to:
1) select the package icedtea-gcjwebplugin from synaptic
2) package -> force version -> 1.0-ubuntu5 (hardy)
3) apply
The update manager will probably notify the newer version again and again: if you update the package to the *ubuntu6*proposed version again, you will came back to the same, boring error. To avoid the update, until it will be fixed, you could do:
- package -> lock version
The package will appear as a "pinned" item.

I hope some maintainer will fix this error soon.

Good luck,
Marco

thank you for the temp solution
i hope it will be fixed soon

proposed patch attached.

only affects the version in hardy-proposed, dropping the milestone and marking bug #211309 as 'verification-failed' instead.

Accepted into -proposed, please test and give feedback here

"fix released", actually, since this is a proposed-only regression.

Updated successfully from 1.0-0ubuntu5 (Hardy) to 1.0-0ubuntu7 (Hardy-proposed)

...
The following packages will be upgraded:
  icedtea-gcjwebplugin
1 packages upgraded, 0 newly installed, 0 to remove and 29 not upgraded.
Need to get 65.7kB of archives. After unpacking 57.3kB will be used.
Do you want to continue? [Y/n/?] Y
Writing extended state information... Done
Get:1 http://ch.archive.ubuntu.com hardy-proposed/universe icedtea-gcjwebplugin 1.0-0ubuntu7 [65.7kB]
Fetched 65.7kB in 0s (215kB/s)
(Reading database ... 121732 files and directories currently installed.)
Preparing to replace icedtea-gcjwebplugin 1.0-0ubuntu5 (using .../icedtea-gcjwebplugin_1.0-0ubuntu7_i386.deb) ...
Unpacking replacement icedtea-gcjwebplugin ...
Setting up icedtea-gcjwebplugin (1.0-0ubuntu7) ...

Reading package lists... Done
Building dependency tree
Reading state information... Done
Reading extended state information
Initializing package states... Done
Building tag database... Done

Second confirmation. I was able to successfully install this.