Here is yet another tip sent to us by reader Mahdi (thanks once again!). This time: how to deactivate password request for mounting partitions in Ubuntu Karmic. Here's what you need to do:

1. Open a terminal and paste this:

sudo gedit /usr/share/polkit-1/actions/org.freedesktop.devicekit.disks.policy

2. In the file you opened with Gedit above, search for this:

<action id="org.freedesktop.devicekit.disks.filesystem-mount-system-internal">

And scrolling down a bit, you will see something like this (for me, it's on line 34 in that file so it should be on the same line for you too, but double check that):

<allow_active>auth_admin_keep</allow_active>

which needs to be changed to:

<allow_active>yes</allow_active>

That's it.