Ah yes, the common Linux distributions like Ubuntu (and possibly Mint as well) used to contain xterm ¡®out-of -the-box¡¯, so the User Guide doesn¡¯t explicitly mention installing it.
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I¡¯ve just added a note to the User Guide to correct this. In general installing things on Linux is very simple, and something all users need to know how to do, which is why I didn¡¯t do this before.