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So whe i type

 /opt/ros/indigo/setup.bash

is that a verbatim copy-paste of the command you're trying to use?

If so: that's not the correct command. You'll want to use source /opt/ros/indigo/setup.bash or . /opt/ros/indigo/setup.bash (note the first dot there).

Also note: Indigo is EOL. Ubuntu Trusty is also EOL.

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