Update README for Ubuntu systemd

[GiuffreLab]

Steps to install on Ubuntu logged in as Ubuntu user on Ubuntu Server 21.10 arm / rpi hardware

Environment Configuration

sudo apt install make && sudo apt install gcc -y

Download library from git

git clone https://github.com/UCTRONICS/U6143_ssd1306.git

Compile the source code

cd /home/ubuntu/U6143_ssd1306/C

make

run from above folder to test display works

sudo ./display

ctrl+c to stop demo

set rc local file in ubuntu

cd

sudo nano /lib/systemd/system/rc-local.service

copy to file at the end then ctrl+x then y then enter to save

[Install] WantedBy=multi-user.target Alias=rc-local.service

create the rc.local file in the etc folder

sudo nano /etc/rc.local

copy to file at the end then ctrl+x then y then enter to save

!/bin/sh

cd /home/ubuntu/U6143_ssd1306/C sudo make clean sudo make sudo ./display &

add permissions for rc-local

sudo chmod +x /etc/rc.local

create a soft link in the /etc/systemd/system directory

sudo ln -s /lib/systemd/system/rc.local.service /etc/systemd/system/

reboot the system to take effect

sudo reboot

test that rc-local service is running

sudo systemctl status rc-local.service