Тихая установка для apt-get

Вы можете добавить флаги --assume-yes и --force-yes, чтобы автоматически сказать «да» всем.

sudo apt-get --assume-yes --force-yes install <packagename(s)>

Чтобы изменения были постоянными, отредактируйте /etc/apt/apt.conf и добавьте строки

APT::Get::Assume-Yes "true";    
APT::Get::force-yes "true";

Вот что говорит страница man apt-get -

   -y, --yes, --assume-yes
       Automatic yes to prompts; assume "yes" as answer to all prompts and
       run non-interactively. If an undesirable situation, such as
       changing a held package, trying to install a unauthenticated
       package or removing an essential package occurs then apt-get will
       abort. Configuration Item: APT::Get::Assume-Yes.

   --force-yes
       Force yes; this is a dangerous option that will cause apt to
       continue without prompting if it is doing something potentially
       harmful. It should not be used except in very special situations.
       Using force-yes can potentially destroy your system! Configuration
       Item: APT::Get::force-yes.