aptitude and/or update manager often hangs

I'm running Kubuntu 8.04 "Hardy Heron" and get the same thing every time I run Synaptic Package Manager. I have to log out, then stop Synaptic and restart Synaptic.

Aptitude under Hardy.
Background:
I recently upgraded from 7.04 through 7.10 to 8.04 and I got the same message from both aptitude and update manager:

Processing triggers for libc6 ...
ldconfig deferred processing now taking place

Because of some frequent glitches with gksu I decided to do a fresh install of Hardy. After getting all upgrades (security, updates, proposed, as of 2008-06-15), for the first package I installed (thunderbird) aptitude produced the same message again.

.............
Configuring thunderbird (2.0.0.14+nobinonly-0ubuntu0.8.04.1) ...

Processing triggers for libc6 ...
ldconfig deferred processing now taking place
Reading packagelists... Done
...............

The installation went fine and thunderbird works fine. Since both update manager and aptitude gives the same message I would suspect dpkg or some other code they have in common to cause the problem.

Same here on KUbuntu 8.04.1:
It seems that the installation ends up good. I usually solve this problem by opening a console, typing xkill and then clicking the hanged-up window with the red cross in order to close it.
This problem may be realted to a strange behaviour observed in Adept Notifier: it does appear constantly in the task bar saying an update of "quicktime-...(whatever)" is required, no matter how many times I close it or apply the update.

I occasionally still get the
"Processing triggers for libc6 ...
ldconfig deferred processing now taking place"
message, but otherwise for me aptitude works fine now.

Is this getting outdated?

Thank you for taking the time to report this bug and helping to make Ubuntu better. You reported this bug a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue for you. Can you try with the latest Ubuntu release? If this is still an issue, can you follow instructions at https://wiki.ubuntu.com/DebuggingUpdateManager and attach any logs/attachments as necessary. Thanks in advance!

We are closing this bug report because it lacks the information we need to investigate the problem, as described in the previous comments. Please reopen it if you can give us the missing information, and don't hesitate to submit bug reports in the future. To reopen the bug report you can click on the current status, under the Status column, and change the Status back to "New". Thanks again!