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Dwarf Fortress starting during apt-get upgrade

When I run apt-get upgrade on my Ubuntu 17.04 machine, sometimes it starts Dwarf Fortress by itself. It has happened already at least two times, so it was probably not just some sort of one time t...

Also, the execution of apt-get upgrade seemed to be paused until I manually quit the Dwarf Fortress, so it most probably wasn't caused by something else running in that time. By making it so that when you type df, Dwarf Fortress starts, you've shadowed the system tool, so when a script wants to - let's say - check if you have enough free space for unpacking an archive, instead of invoking df- the system tool - it'll start Dwarf Fortress instead. And after you quit Dwarf Fortress, the poor little script will be very confused as to why it wasn't given the disk usage information it asked for.

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