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Hi Thierry, see comments below and screenshots attached.
I did not spend so much time logged as root. I did not see the problem then, but I'd have to spend more time trying to give a real answer.
That may help, jsut to understand if the problem is general or strictly related to user or policies.
Re 5), when it fails, you can go in Konqueror, search the Storage Media in the treeview which in turn lists the available known drives. Then double click on your failed disk and see if it gets mounted again or not. Alternatively, you can type "media:/sdg1" (or whatever path) in the location bar and press enter.
media:/sdg1 works
So the second time around it works.
Now that you have d-feet installed, can you also make another test. After a failed mounting, open d-feet, search the system bus for udisk2 and select it. On the right side you will see many interfaces. Search for object path /org/freedesktop/UDisks2/block_devices/sdg1 (or other path), expand it and please paste a screenshot.
Done (4 snapshots!)Sorry, that is the wrong path :-$
See example screenshot d-feet.png, take note the path includes "block_devices". If the disk is recognized, you should see your sdg1 disk there and using the Mount/Unmount functions you can try to mount/unmount the disk directly from d-feet. use {} as parameter of the calls.
Finally, one more thing. Open KDCOP, search for kded -> mediamanager -> fullList function (going by memory here, may be slightly different name). Double click to execute. In the result section, you will have a list of known disks. Can you find your disk there? If so, can you paste a screenshot of the properties of that disk?
You get another snapshot
See example screenshot kdcop.png. You need to double click fullList() function and search for your disk in the section below. This is to see if you disk has been detected by TDE or not.
It seems there may be something interfering with the first attempt of mounting the disk. Whether this is somewhere in TDE code or not, I am not sure. I will see if I can reproduce the problem here.
Cheers Michele