I don't know how to update packages in a stable Ubuntu version. You may want to try installing the latest version from the davical-current repo, see https://people.debian.org/~fsfs/davical-current/setup.sh
I don't know how to update packages in a stable Ubuntu version. You may want to try installing the latest version from the davical-current repo, see https:/ /people. debian. org/~fsfs/ davical- current/ setup.sh