Thanks for the report! There are new upstream releases of both Galera 3 and Galera 4, and I intend to upload them and work with any remaining FTBFS issues in coming weeks.
- Bug#961636: src:galera-3: fails to migrate to testing fo... Paul Gevers
- Bug#961636: [debian-mysql] Bug#961636: src:galera-3... Otto Kekäläinen