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whebn I plug in the external hdd into the usb-port I get a message-window saying

Error mounting: mount exited with exit code 1: helper failed with:
mount: can't find /dev/sdb1 in /etc/fstab or /etc/mtab

I remember in past it always worked. what could have gone wrong? how does this automounting work? what is this helper? where is the helper-script? how do I debug it? with sudo it works on the commandline:

sudo mount /dev/sdb1 /mnt

so if someone could tell me what command-line will let a user mount the drive to gnome's media:// I could search the solution there. this problem is not reproducible, and after a reboot everything works fine. I just would like to know how to evade restarting X.

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what do you mean when you say with sudo it works? Can you edit your question to include what you did ? –  Mahesh Nov 18 '12 at 9:05
    
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