I want to create a desktop shortcut for updating the client image. I 
tried a standard desktop shortcut with the relevant line:

Exec=sudo ltsp-update-image --cleanup /

but running that produces no results.

I also tried modifying that to:

Exec=gksudo ltsp-update-image --cleanup /

But likewise running that produces no results.

-----------------------------------------------

I also tried creating a bash script with the contents:

#!/bin/bash
gksudo ltsp-update-image --cleanup /

And alternatively with:

sudo ltsp-update-image --cleanup /

and simply with:

ltsp-update-image --cleanup /

Trying to run any of those versions, it prompts to Execute or to Execute 
in Terminal, but none of those choices runs the update or even prompts 
for a password.

What am I doing wrong?

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