sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade
sudo apt autoremove

sudo sed -i 's/ulyana/ulyssa/g' /etc/apt/sources.list.d/official-package-repositories.list 

sudo apt update
sudo apt upgrade
sudo apt dist-upgrade
sudo apt autoremove

sudo /usr/share/ubuntu-system-adjustments/systemd/adjust-grub-title
sudo /usr/lib/linuxmint/mintsystem/mint-adjust.py

#update version number in grub menu
sudo update-grub

#usr merge
sudo apt install usrmerge
sudo apt purge usrmerge