The thing is with the sage windows appliance as has been said. In order to keep the ova file to the minimum most programs has been erased, including gedit. I think that in your case your best bet would be to download a virtualbox image of a linux distibution that is supported by sage (fedora or ubuntu) and that has the tools you are used to (gedit). Then, in that guest machine, install the binary sage for the linux of your choice. That way you can also update the sage app without downloading a full new virtual image.
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