i have Ubuntu with lightdm desktop (lubuntu) running as a live system in RAM.

"df -h" shows i have low disk space on "/" partition
How you would suggest to delete unnecessary parts of the OS?

I tried:
sudo apt clean all
echo "Shows largest packages installed:";dpkg-query -W --showformat='${Installed-Size} ${Package}\n' | sort -nr | head -n 10
sudo apt purge UnnecessaryPackageName

Which directories can i delete?