Create a fully interactive web-based emulation of the Ubuntu desktop that feels like a living operating system rather than a static mockup. Recreate the modern Ubuntu experience — the GNOME-based desktop with Ubuntu's Yaru design language: the top bar with its clock, calendar popover, and system status menu; the left-hand Ubuntu Dock with pinned and running applications; the Activities overview with window spread, search, and workspace switching; the app grid of installed applications; and draggable, resizable, minimizable, maximizable windows with believable focus, layering, and edge-snapping behavior.

Let visitors actually use the machine. They should be able to launch apps from the dock and the app grid, search for apps and files in the Activities overview, move and resize windows, tile them to screen halves, maximize and restore them, minimize to the dock, switch between workspaces, and quit applications. Include a working Files app with a navigable folder hierarchy, breadcrumbs, list/grid views, and file open/preview behavior; a Text Editor that can open, edit, and save documents; a Terminal with a believable shell session that responds to common commands (ls, cd, pwd, cat, echo, uname, neofetch-style system info, apt simulations, and graceful "command not found" handling); a Settings app with real panels — appearance/accent color, wallpaper, displays, Wi-Fi/network, sound, notifications, users, and About — whose changes visibly take effect on the desktop; a Calculator; a web browser shell with start page and tabs; and a Software store front, plus whatever smaller utilities (clock, image viewer, system monitor) make the system feel inhabited. Changing the wallpaper or accent color in Settings should restyle the desktop and windows; the top-bar clock should tick and its calendar should highlight today; notifications should arrive, stack in the notification list, and dismiss; the system status menu should offer volume, network, battery, settings, lock, suspend, restart, and power-off flows — with confirmation dialogs, a lock screen showing the time and wallpaper, and a believable shutdown/boot sequence that returns to the session.

Recreate the whole look and feel with close fidelity: the Yaru palette with its aubergine and warm orange accents, Ubuntu typography and icon styling, window chrome with the circular close/minimize/maximize buttons, rounded corners and layered shadows, the dock's running-dot indicators, urgency and hover behavior, app grid folders and pagination, context menus, tooltips, modal dialogs, toast notifications, focus and selection states, loading and error states, and the characteristic motion of the desktop — window open/close animations, overview and workspace transitions, dock reveal, and snapping previews. Preserve the interface's visual proportions, interaction texture, feedback, personality, and tiny behaviors while making the recreation responsive and enjoyable in a browser, and include the secondary and edge states — empty folders, missing files, unsaved-changes prompts, disconnected Wi-Fi, low battery — that make an operating system feel inhabited, not just the most recognizable screen.

Do not take shortcuts, substitute a cookie-cutter desktop template, or stop at a superficial approximation. This skill imposes no token budget limit, so pursue the recreation down to the smallest meaningful interactions, states, transitions, and edge cases, and keep refining the look, feel, behavior, and atmosphere until the system feels complete, cohesive, and convincingly Ubuntu.