Using PuTTY on Ubuntu I got the following error – “ Unable to open connection to: Unable to open serial port“.
Normally when the serial console is accessed using the terminal emulator of your choice as a non-root user you’ll get a “permission denied” error. dev/ttyUSBn and they can be accessed using terminal emulator applications like PuTTY, minicom and screen. dev/ttySn and USB-to-Serial adapters as /dev/ttyUSB0, …. Linux identifies inbuilt serial ports as /dev/ttyS0, /dev/ttyS1,…. On computers which do not have built-in serial ports USB-to-Serial adapters can be used.
The ancient serial port which is no longer found on the latest motherboards and even the not so latest laptops is still used for connecting to the console of networking devices, headless computers and a lot other applications.
