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I'm trying to open a serial port in GtkTerm (downloaded from Ubuntu Software Center), however I'm getting "Cannot open /dev/ttyS0: Permission denied" error.

Ubuntu Version: 14.04

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2 Answers 2

Reset to default
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Add yourself to the dialout group. It has read/reite permission to that device:

sudo usermod -a -G dialout <user>

and restart the session.

(groups command shows your groups)

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  • sudo su <user> worked without restarting, just export the display after
    – Ray Foss
    Nov 17, 2020 at 18:56
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Use following command:

gksu gtkterm
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  • This is probably not advised as you can enable access with the dialout group and not have to use/provide su rights to users.
    – tdpu
    Nov 10, 2023 at 19:35

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