Ubuntu 26.10 will transition its default D-Bus implementation from dbus-daemon to dbus-broker. This change, effective with the upcoming 26.10 release, marks the first time Ubuntu has altered its D-Bus default since 2004, retiring the dbus-daemon after 22 years of service. D-Bus acts as a crucial message bus, facilitating inter-process communication (IPC) between applications and the operating system. Examples include the Ubuntu Dock displaying unread-count badges or the desktop detecting USB device insertions. The switch to dbus-broker aims to introduce a more modern and potentially more performant solution. While this is a significant under-the-hood alteration, the source notes that "a change end-users are unlikely to notice."