Umbrello UML Modeller is a Unified Modelling Language diagram editor for KDE.
It can create diagrams of software and other systems in the industry-standard
UML format, and can also generate code from UML diagrams in a variety of
programming languages.
Snaps are applications packaged with all their dependencies to run on all popular Linux distributions from a single build. They update automatically and roll back gracefully.
Snaps are discoverable and installable from the Snap Store, an app store with an audience of millions.
Enable snapd
On Debian 9 (Stretch) and newer, snap can be installed directly from the command line: