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I want to get more RAM for my computer, and I understand that to get the right type of RAM I have to know the memory type and speed (minimum and maximum as far as I understand). So how do I find these things out? And is there anything I need to know about the memory before I can get more RAM which will actually fit with the specifications of my computer? I am running Ubuntu GNOME 16.04 with GNOME 3.20.
Note: I know that there are Terminal commands to find out this information, I just can't remember what they are.