I know it sounds strange but I can't add the guest-user to any group in porteus. I am trying to set-up my scanner in porteus and iscan can't connect to the USB-port. Also, the arduino-software can't connect to the usb2serial-adapter I use. I need to start arduino as root to get access.
So when I type
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sudo usermod -a -G dialout,lp,scanner guest
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sudo: usermod: Unknown command
When I type
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id
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uid=1000(guest) gid=100(users) Gruppen=100(users),93(scanner),1000(vbox)
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# groupadd dialout
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# groupadd lp
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# groupadd scanner
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groups
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root scanner vbox
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users scanner vbox