Completely uninstall elasticsearch in Linux
sudo apt-get remove elasticsearch
sudo apt-get --purge autoremove elasticsearch
sudo dpkg --remove elasticsearch
sudo dpkg --purge elasticsearch
sudo dpkg --purge --force-all elasticsearch
sudo rm -rf /var/lib/elasticsearch/
sudo rm -rf /etc/elasticsearch
If still facing any issues then you have to delete source file too.
cd /etc/apt/sources.list.d/
sudo rm -rf elastic-*