hi,i wrong configured the serial in minicom with name ttyubs0 also tty USB0 , i changed the setting after saved bat every time i go to minicom i have an erro like "cannot open file ttyusb0.

What are the contents of your minirc.dfl file ?

In Ubuntu it’s stored at /etc/minicom/minirc.dfl

and what is the output from:

ls -a /etc/minicom