Marked as the first point release to the major Snapd 2.2 series, which introduced classic confinement support, Snapd 2.21’s highlights include the new physical-memory-* and io-ports-control interfaces, enablement of the getsockopt interface by default everyhwere, and support for installing classic confined Snaps from the Snappy Store. Snapd 2.21 also improves alias handling with a new “snap aliases” command that would allow users to list available aliases and their current status, as well as auto-alias enhancements. Moreover, it improves the output of the “snap find” command when nothing is found and switches to a pure, Go-based gettext implementation.