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I just used archinstall to install arch in VirtualBox with the xorg profile and also installed htop, neofetch and firefox. When I typed htop into the command line, htop launched:

here's htop

That looks, normal right? But when I typed firefox, I got an error:

error:no DISPLAY environment variable specified

here's the error too

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    Are you actually having X11 in use? It appears from your screenshots that you are not using a GUI running in the VM but are using a terminal. You should describe how you are accessing the VM. Commented Jun 18, 2022 at 14:50
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    Yes, Arch won't install a graphical environment by default. Now, installing firefox might have brought the relevant packages in, but you would still need to launch X or at least reboot and see if it now presents you with a graphical login. But you won't be able to run graphical tools like firefox without a GUI. Commented Jun 18, 2022 at 16:34

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You likely want to install a desktop environment which makes use of a ‘display manager’. Without said display manager you will have no DISPLAY environment value and so GUI programs won’t really have much to work with.

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