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Possible Duplicate:
Lock and Unlock from USB disk (pendrive)

When i use Windows, there is a program I use called Predator that locks my PC when I remove a certain USB flash drive. It then unlocks the computer when I reinsert it.

Is there any program like this for Ubuntu?

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marked as duplicate by SirCharlo, jokerdino, January, Mitch, TheXed Sep 28 '12 at 13:41

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Can you explain what the program does? – January Sep 28 '12 at 12:14
@January You don't know about Predator? :O – SirCharlo Sep 28 '12 at 12:17
@SirCharlo I do know about this Predator only; since I hardly ever used Windows, I can hardly know every weird little program for Windows. – January Sep 28 '12 at 12:20
@January – user84277 Sep 28 '12 at 12:21
Why would anyone use anything like that? Escapes my comprehension. – January Sep 28 '12 at 12:24
up vote 1 down vote accepted

Don't know of any program but you can create a simple script that can do that like in this example:

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how i can find my USB ID ? – user84277 Sep 28 '12 at 12:36
It's explained on that site in terminal " lsusb and locate your USB Device..." – Branimir Kolar Sep 28 '12 at 12:38
is there any recovery when i lost my drive? – user84277 Sep 28 '12 at 12:39
@EnesKuray Check out my last comment, under your question. – SirCharlo Sep 28 '12 at 12:42
@EnesKuray you can always enter your password to login to desktop – Branimir Kolar Sep 28 '12 at 12:53

Well, a module called PAM (Pluggable Authentication module) can be customized to achieve your need. A beautiful article is available on linuxconfig describing this in detail.

The steps are:

  1. Install PAM

    $ sudo apt-get install pamusb-tools libpam-usb
  2. Add USB device to PAM config

    $ sudo pamusb-conf --add-device <my-usb-stick>
  3. Select your volume and "Y" to save

  4. Define user for PAM auth

    $ sudo pamusb-conf --add-user <ubuntu-user>
  5. Select and "Y" to save

  6. Configure PAM

    $ sudo gedit /etc/pam.d/common-auth
  7. Add the line below and save

    auth    sufficient
  8. Test the PAM auth

    $ su ubuntu-user
  9. Lock when disconnected

    $ sudo gedit /etc/pamusb.conf
  10. Modify the block "user" block to look like:

    <user id="ubuntu-user"> 
          <agent event="lock">gnome-screensaver-command -l</agent> 
          <agent event="unlock">gnome-screensaver-command -d</agent> 

cuttlefish could be one solution to do it as @maythux suggested. I really can't comment on its capabilities, I prefer to stay away from 3rd party apps as much as possible.

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You can use cuttlefish

It does what you need plus more advanced options see this link to learn about

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