Ubuntu Device and Keys
4K HD Wallpaper: Ubuntu Device & Keys
The 4K picture can be downloaded completely free under CC0 license from courtesy of Luis Wilker and use in various projects (templates, apps, blog articles...) or to be set on desktop backgrounds and homescreen phones.
Widescreen Desktop / Macbook: 2560x1600 (fits on: 1920x1200, 1440x900, 1280x800)
High Definition HD 1080p: 1920x1080 (fits on: 1600x900, 1366x768, 1280x720)
Samsung Galaxy Tab & iPad: 2048x1536 (compatible with almost all tablets)
HTC, Samsung Galaxy & iPhone: 1080x1920 (compatible with many smartphones)