Valentina is an open-source software for creating clothing articles. Among others, it allows the users to create cloth patterns using either standard sizes or custom set of measurements, using traditional methods to create unique pattern tools.
The latest version available is Valentina 0.6.1, which has been released a while ago.
While there is no official Valentina repository or PPA, there is a third party one, containing the latest versions of Valentina, as it gets updated.
The below instructions should work on all the supported Ubuntu systems and derivatives: Ubuntu 18.10 Cosmic Cuttlefish, Ubuntu 18.04 Bionic Beaver, Linux Mint, Elementary OS and other Ubuntu derivative systems.
$ sudo add-apt-repository ppa:dismine/valentina
$ sudo apt-get update
$ sudo apt-get install valentina
If you want to remove valentina, do:
$ sudo apt-get remove valentina