They only collect data of the installation process. Once installation is complete, no additional data is collected. They've even publicly released the results.

They only collect data of the installation process. Once installation is complete, no additional data is collected. They've even publicly released the results. >The collected data is not-personally-identifiable. Meaning that a user cannot be singled out or tracked based on the data he/she provided. Here’s what Ubuntu collects > Version and flavor of Ubuntu you’re installing > Whether you have network connectivity at install time > Hardware statistics such as CPU, RAM, GPU, etc > Device manufacturer > Country > Installation time > Whether you choose auto login, installing third-party codecs, downloading updates during install > Disk layout https://itsfoss.com/ubuntu-data-collection-stats/ https://itsfoss.com/ubuntu-data-collection-stats/