# apt install collectd Reading package lists... Done Building dependency tree... Done Reading state information... Done Package collectd is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'collectd' has no installation candidate
バグらしいです。
こちらに記載の手順でdebファイルをダウンロードし、インストールできました。
# wget https://launchpad.net/ubuntu/+archive/primary/+files/collectd-core_5.12.0-11_amd64.deb # wget https://launchpad.net/ubuntu/+archive/primary/+files/collectd_5.12.0-11_amd64.deb # apt install ./collectd-core_5.12.0-11_amd64.deb ./collectd_5.12.0-11_amd64.deb
