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#1 2025-07-02 14:25:28

ComputerPile
Member
Registered: 2025-07-02
Posts: 5

New Install - Can't Utilize Serial USB Connection

Hi everyone,

I have a new installation of Arch, and I've been trying to use a USB serial connection through Termius.

When I try to initialize a connection I am presented with the following message: Connection can not be established: Error: Operation not permitted, cannot open /dev/ttyUSB0

I have also attempted the connection through PuTTY and receive the same error message of "Operation not permitted"

I have added my user to both the uucp and tty groups, but I am still unable to connect.

I have also run chmod a+rw /dev/ttyUSB0 I have no success either.

Could there be something I am missing, or something else I could try?

I appreciate the assistance!

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#2 2025-07-02 21:13:11

unixman
Member
Registered: 2015-03-12
Posts: 182

Re: New Install - Can't Utilize Serial USB Connection

ls -l shows caller's permissions on files. try to connect as 'root' user.

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#3 2025-07-03 23:42:06

ComputerPile
Member
Registered: 2025-07-02
Posts: 5

Re: New Install - Can't Utilize Serial USB Connection

Thank you for the response. The /dev/ttyUSB0 device is owned by root and is in the root group.

I'm going to try running Termius and PuTTY as root, but I've left my laptop at work.

It's a holiday weekend where I am at, and unless I can stop by the office to pick it up, I may have to wait until Monday to give it a try.

I will keep you posted. Thank you again.

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