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Unfortunately there are currently no Ubuntu/Debian repositories for gambas3. It's not possible to install the *.deb file at this time. Please use the executable nxcEditor-file (gambas2) or download the sources of Gambas 3 and compile them on your system, then you can use the executable nxcEditor-file (gambas3).
For the new gambas3 repositories for Ubuntu look at http://gambas.sourceforge.net