На этот вопрос уже есть ответ здесь:
Я появляется следующая ошибка при попытке установить Skype
Failed to download repository information
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E:The repository 'http://archive.ubuntu.com/ubuntu yakkety Release' does not have a Release file.
W:Updating from such a repository can't be done securely, and is therefore disabled by default.
W:See apt-secure(8) manpage for repository creation and user configuration details.
E:The repository 'http://security.ubuntu.com/ubuntu yakkety-security Release' does no longer have a Release file.
W:Updating from such a repository can't be done securely, and is therefore disabled by default.
W:See apt-secure(8) manpage for repository creation and user configuration details.
E:The repository 'http://in.archive.ubuntu.com/ubuntu yakkety Release' does no longer have a Release file.
W:Updating from such a repository can't be done securely, and is therefore disabled by default.
W:See apt-secure(8) manpage for repository creation and user configuration details.
E:The repository 'http://in.archive.ubuntu.com/ubuntu yakkety-backports Release' does no longer have a Release file.
W:Updating from such a repository can't be done securely, and is therefore disabled by default.
W:See apt-secure(8) manpage for repository creation and user configuration details.
E:The repository 'http://in.archive.ubuntu.com/ubuntu yakkety-updates Release' does no longer have a Release file.
Вы используете Ubuntu Як Yakkety (16.10), который является вне поддержки и EOL (Конец Жизни).
Необходимо обновить до более новой Версии Ubuntu. Поскольку Ubuntu 16.10 Обновит до 17,04, который является также EOL, который необходимо обновить до 17,10.
Можно сделать так путем выполнения sudo do-release-upgrade
.