Just replace PATH_TO_YOUR_MODELS with the absolute (or relative) path to your ollama models directory (usually /usr/share/ollama/.ollama/models/)
sudo find PATH_TO_YOUR_MODELS -type f -exec chown ollama:ollama {} \;
sudo find PATH_TO_YOUR_MODELS -type d -exec chown ollama:ollama {} \;
sudo find PATH_TO_YOUR_MODELS -type f -exec chmod 644 {} \;
sudo find PATH_TO_YOUR_MODELS -type d -exec chmod 755 {} \;
PS: kudos for Jeron_Baffom