byobu includes a set of profiles for the GNU screen window manager.
These profiles are quite useful on server machines which are not running
a graphical desktop. The 'screen' command provides a number of advanced
features are not necessarily exposed in the default profile. These profiles
provide features such as status bars, clocks, notifiers (reboot required,
updates available), etc. The profile-switcher allows users to quickly switch
their .screenrc to any of the available profiles.
update-notifier-common provides a more efficient and standard mechanism for
calculating the number of updates available in the status panel.