I have had some issues with Ollama not being up-to-date. If Ollama is installed with a curl command, it adds a systemd service.
sudo systemctl stop ollama
sudo systemctl disable ollama
sudo rm /etc/systemd/system/ollama.service
sudo systemctl daemon-reload
sudo rm /usr/local/bin/ollama
sudo userdel ollama
sudo groupdel ollama
rm -r ~/.ollama
sudo rm -rf /usr/share/ollama
That is about it.