Hi Postgresql 11 is not released yet. You need specify repository explicitly, as say in wiki: https://wiki.postgresql.org/wiki/Apt/FAQ#I_want_to_try_the_beta_version_of_the_next_PostgreSQL_release Debian experimental repository can contains some experimental or beta version packages. regards, Sergei
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Соглашаюсь с условиями обработки персональных данных