Irecently installed this drawing program from its homepage ( -edrawmax-linux.php here is the link). Now I no longer want it on my computer, but the application does not appear listed when I look for it using the dpkg --list command on the terminal; therefore, when I try to remove it using apt-get, it just says that it can't locate the package (I type sudo apt-get remove edrawmax, because edrawmax is the command with which you execute the program from the terminal, but this is evidently not the correct thing to do). I found where the directory of this application is located (it is located in "/opt"), but I do not dare to just delete all the files. What should i do?
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