Portable Snap packages have been available for many Linux users for some time, but most distributions have avoided installing Snaps by default. It looks as though Ubuntu 18.04 will be one of the first distributions (after Ubuntu MATE) to experiment with including Snaps as default packages. Steve Langasek wrote a mailing list post with more details: "We are confident that Snaps today represent a solid delivery vehicle for third-party software on top of Ubuntu, and that Snaps stand as a first-class alternative to Deb packages for Ubuntu users where appropriate. Snaps are already presented alongside Debs in the software catalog on the Ubuntu Desktop, and with the 17.10 release, the Ubuntu MATE team took the first foray into including Snaps by default in an Ubuntu flavor image. Now in Ubuntu 18.04 LTS, we are looking at broadening the inclusion of Snaps in Ubuntu images by default. This raises important questions about what the policies should be for software installed by default as a Snap, since the review processes around the Ubuntu archive for Universe and Main don't directly translate to the Snap Store."