No package for windows or linux platform

i’m using linux mint - i can’t packaging project - no option for that
i’m trying to install mono-gmcs - get this error

#sudo apt-get install mono-gmcs “if this solve the problem”
Reading package lists… Done
Building dependency tree
Reading state information… Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
mono-gmcs : Depends: mono-mcs (= 3.12.1-0xamarin1) but is to be installed
E: Unable to correct problems, you have held broken packages.

help me please to can export project as a game for windows and linux and other platforms

thank you in advace