Dear Maintainer, The b4 bugs subcommand which was added in b4 0.16 (marked as a technology preview upstream) needs the git-bug binary, version 0.10.1 or later. git-bug isn't packaged in Debian yet (RFP #910108), so b4 bug commands fail with: git-bug is not installed Once git-bug is in the archive, b4 should add it to Depends or Recommends (I'd lean to Depends, depending on how lightweight the git-bug binary is) and this bug can be closed.