There is a way to burn/extract .gbi files in linux, just use daa2iso.
The easiest way is to use the windows version under wine.
1 download daa2iso.zip (google)
2 extract to new folder
3 copy the .gbi file to that folder
4 open Konsole and CD to that folder
5 TYPE wine daa2iso.exe name.gbi name.iso
**replace name with the name of the file**
this will extract the .gbi, then you can mount or view the files with eg Acetoneiso2.
Hope this helps.