Caffeine is in Ubuntu since 15.10, so feel free to file a bug against Ubuntu asking for it in the default install. I would guess you simply file a bug against ubuntu-desktop (or the relevant metapackage for your preferred desktop), but I don't know.
Caffeine is in Ubuntu since 15.10, so feel free to file a bug against Ubuntu asking for it in the default install. I would guess you simply file a bug against ubuntu-desktop (or the relevant metapackage for your preferred desktop), but I don't know.