Ubuntu 14.04 ‘Trusty Tahr'
The first wallpaper to meld the old look of the desktop with the new mobile-orientated Suru design style.
Ubuntu 15.04 ‘Vivid Vervet'
Fittingly for a release called ‘Vivid', the desktop wallpaper made an impact with an unexpected dark look. The new ‘Suru' design introduced the year previous remains.
Ubuntu 15.10 ‘Wily Werewolf'
The wallpaper for the Wily Werewolf keeps the new Suru design language but quietens the darkness of the preceding purple gradient. The result is a lighter overall appearance with angular blocks offsetting corner folds.
Ubuntu 16.04 LTS ‘Xenial Xerus'
The latest Ubuntu wallpaper is the brightest, lightest entry in a long time. It features more orange and new faceted geometric sectioning to create a ‘web-like' look.
Ubuntu 16.10 ‘Yakkety Yak'
The lighter, brighter theme continues with the Yakkety Yak within more orange gradient added. The angular geometry introduced in the previous wallpaper continues, now covering a more substantial portion of the screen.
Well, there you have it every default Ubuntu wallpaper from Ubuntu 4.10 Warty Warthog to 16.10 Yakkety Yak. Check out this site where you can download more Ubuntu default wallpapers.