For me I've found the solution.
A few of the directories below "~/.local/share/akonadi/db_data/" were owned by mysql and they needed to be owned by the current user.
sudo chown -R your-user-name:your-user-name /home/your-user-name/.local/share/akonadi/db_data/
For me I've found the solution.
A few of the directories below "~/.local/ share/akonadi/ db_data/ " were owned by mysql and they needed to be owned by the current user.
sudo chown -R your-user- name:your- user-name /home/your- user-name/ .local/ share/akonadi/ db_data/