Setup serial TTY console access on Linux

On the server

Add this to your ``/etc/default/grub` file:

## Serial console
GRUB_CMDLINE_LINUX_DEFAULT="console=tty0 console=ttyS0,115200n8"
GRUB_TERMINAL=serial
GRUB_SERIAL_COMMAND="serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1"

Note: ttyS0 is referring to the server's serial port number (here 0, COM1)

Rebuild the grub.cfg file with following command:

sudo grub-mkconfig -o /boot/grub/grub.cfg

or do an entire update-grub:

sudo update-grub

On the client

Linux

To connect to the server with a Linux machine, input this into the console:

screen /dev/ttyS0 115200

Note: ttyS0 is referring to the client's serial port number (here 0, COM1)

Windows

To connect to the server with a Windows machine, use PuTTY or Terminalbpp

Get more information about serial ports

sudo setserial -g /dev/ttyS0 sudo cat /proc/tty/driver/serial dmesg | grep tty ps aux | grep tty

Detailed guide (from the Arch Wiki)

https://wiki.archlinux.org/title/Working_with_the_serial_console#Configure_console_access_on_the_target_machine