manualy upgrade linuxmint 19 to 19.3

manualy upgrade linuxmint 19 to 19.3

#Check current system

lsb_release -a

this will show 

Distributor ID: LinuxMint
Description:    Linux Mint 19 Tara

#Change Your Repository to "Tricia"
because our  system is still using Tara (Linux Mint 19) repositories, we need to switch them to Tricia (Linux Mint 19.3).

Run this command:
sudo sed -i 's/tara/tricia/g' /etc/apt/sources.list.d/official-package-repositories.list
then
sudo apt update

#Upgrade to Linux Mint 19.3

sudo apt upgrade -y
sudo apt dist-upgrade -y

After the upgrade, reboot your system:
sudo reboot

Once the system reboots, verify the upgrade:
lsb_release -a

It should now show:
Distributor ID: LinuxMint
Description:    Linux Mint 19.3 Tricia

#Install the Latest Mint Update Manager

To ensure everything is up to date, install the latest Mint Update Manager:
sudo apt install --reinstall mintupdate mint-upgrade-info -y

Then refresh package sources and check for additional updates:
sudo apt update && sudo apt upgrade -y

Done!
You are now on Linux Mint 19.3 Tricia!

From here, you can do upgrade to Linux Mint 20