Owncloud 没有安装候选，我该如何解决？
Owncloud has no installation cadidate, how do I fix?
我正在尝试在 Ubuntu 16.04 的全新安装上安装 Owncloud 服务器，并且一直在关注 these instructions from Digital Ocean，直到命令
$ sudo apt-get install owncloud
所以我尝试了运行
$ sudo apt-get install owncloud-files
安装了哪些东西，但它没有按照 Digital Ocean 说明按预期执行安装程序
明确地说，我已经完成了安装 owncloud 之前的所有步骤。
$ sudo curl https://download.owncloud.org/download/repositories/stable/Ubuntu_16.04/Release.key | sudo apt-key add -
[sudo] password for user:
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 4502 100 4502 0 0 3847 0 0:00:01 0:00:01 --:--:-- 3847
OK
$ echo 'deb https://download.owncloud.org/download/repositories/stable/Ubuntu_16.04/ /' | sudo tee /etc/apt/sources.list.d/owncloud.list
deb https://download.owncloud.org/download/repositories/stable/Ubuntu_16.04/ /
$ sudo apt-get update
Ign:1 http://dl.google.com/linux/chrome/deb stable InRelease
Get:2 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]
Hit:3 http://us.archive.ubuntu.com/ubuntu xenial InRelease
Hit:4 http://dl.google.com/linux/chrome/deb stable Release
Get:5 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB]
Hit:6 http://ppa.launchpad.net/certbot/certbot/ubuntu xenial InRelease
Ign:7 http://download.opensuse.org/repositories/isv:/ownCloud:/desktop/Ubuntu_16.04 InRelease
Get:9 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB]
Hit:10 http://download.opensuse.org/repositories/isv:/ownCloud:/desktop/Ubuntu_16.04 Release
Get:11 http://security.ubuntu.com/ubuntu xenial-security/main amd64 DEP-11 Metadata [60.3 kB]
Get:12 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages [644 kB]
Get:14 http://security.ubuntu.com/ubuntu xenial-security/main DEP-11 64x64 Icons [57.6 kB]
Get:15 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 DEP-11 Metadata [49.6 kB]
Get:16 http://security.ubuntu.com/ubuntu xenial-security/universe DEP-11 64x64 Icons [80.0 kB]
Get:17 http://us.archive.ubuntu.com/ubuntu xenial-updates/main i386 Packages [611 kB]
Get:18 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 DEP-11 Metadata [305 kB]
Ign:19 https://download.owncloud.org/download/repositories/stable/Ubuntu_16.04 InRelease
Get:20 http://us.archive.ubuntu.com/ubuntu xenial-updates/main DEP-11 64x64 Icons [213 kB]
Get:21 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages [540 kB]
Get:22 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe i386 Packages [516 kB]
Get:23 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 DEP-11 Metadata [173 kB]
Get:24 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe DEP-11 64x64 Icons [240 kB]
Get:25 http://us.archive.ubuntu.com/ubuntu xenial-updates/multiverse amd64 DEP-11 Metadata [5,888 B]
Get:26 http://us.archive.ubuntu.com/ubuntu xenial-backports/main amd64 DEP-11 Metadata [3,328 B]
Get:27 http://us.archive.ubuntu.com/ubuntu xenial-backports/universe amd64 DEP-11 Metadata [4,584 B]
Hit:28 https://download.owncloud.org/download/repositories/stable/Ubuntu_16.04 Release
Fetched 3,809 kB in 1s (1,932 kB/s)
Reading package lists... Done
$ sudo apt-get install owncloud
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package owncloud 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
However the following packages replace it:
owncloud-files
E: Package 'owncloud' has no installation candidate
这就是我按照步骤操作时发生的一切，它仍然说没有 'owncloud' 安装候选。
这里的问题是 ownCloud 最近删除了 owncloud 元数据包（这在同时托管多个应用程序的环境中可能有害）。 owncloud-files 包的区别是 described in the docs:
owncloud-files (recommended): This package installs only ownCloud. It does not install Apache, a database, or any PHP dependencies.
owncloud: This package installs ownCloud, complete with all dependencies.
所以，基本上，您在系统上下载并安装了 ownCloud（您会看到它位于 /var/www/owncloud 目录下。）- 但现在它缺少依赖项。您需要手动安装它们；您可以在以下位置看到一个列表：https://doc.owncloud.org/server/10.0/admin_manual/installation/source_installation.html#install-the-required-packages:
sudo apt install -y apache2 mariadb-server libapache2-mod-php7.0 \
php7.0-gd php7.0-json php7.0-mysql php7.0-curl \
php7.0-intl php7.0-mcrypt php-imagick \
php7.0-zip php7.0-xml php7.0-mbstring
安装后，系统会提示您使用 DigitalOcean 教程中缺少的 apache 向导。从那里您将能够自定义服务器安装。如果您需要有关如何完成该过程的更多信息，请参阅：configuring the apache server and completing the installation
我正在尝试在 Ubuntu 16.04 的全新安装上安装 Owncloud 服务器，并且一直在关注 these instructions from Digital Ocean，直到命令
$ sudo apt-get install owncloud
所以我尝试了运行
$ sudo apt-get install owncloud-files
安装了哪些东西，但它没有按照 Digital Ocean 说明按预期执行安装程序
明确地说，我已经完成了安装 owncloud 之前的所有步骤。
$ sudo curl https://download.owncloud.org/download/repositories/stable/Ubuntu_16.04/Release.key | sudo apt-key add -
[sudo] password for user:
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 4502 100 4502 0 0 3847 0 0:00:01 0:00:01 --:--:-- 3847
OK
$ echo 'deb https://download.owncloud.org/download/repositories/stable/Ubuntu_16.04/ /' | sudo tee /etc/apt/sources.list.d/owncloud.list
deb https://download.owncloud.org/download/repositories/stable/Ubuntu_16.04/ /
$ sudo apt-get update
Ign:1 http://dl.google.com/linux/chrome/deb stable InRelease
Get:2 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]
Hit:3 http://us.archive.ubuntu.com/ubuntu xenial InRelease
Hit:4 http://dl.google.com/linux/chrome/deb stable Release
Get:5 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB]
Hit:6 http://ppa.launchpad.net/certbot/certbot/ubuntu xenial InRelease
Ign:7 http://download.opensuse.org/repositories/isv:/ownCloud:/desktop/Ubuntu_16.04 InRelease
Get:9 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB]
Hit:10 http://download.opensuse.org/repositories/isv:/ownCloud:/desktop/Ubuntu_16.04 Release
Get:11 http://security.ubuntu.com/ubuntu xenial-security/main amd64 DEP-11 Metadata [60.3 kB]
Get:12 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages [644 kB]
Get:14 http://security.ubuntu.com/ubuntu xenial-security/main DEP-11 64x64 Icons [57.6 kB]
Get:15 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 DEP-11 Metadata [49.6 kB]
Get:16 http://security.ubuntu.com/ubuntu xenial-security/universe DEP-11 64x64 Icons [80.0 kB]
Get:17 http://us.archive.ubuntu.com/ubuntu xenial-updates/main i386 Packages [611 kB]
Get:18 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 DEP-11 Metadata [305 kB]
Ign:19 https://download.owncloud.org/download/repositories/stable/Ubuntu_16.04 InRelease
Get:20 http://us.archive.ubuntu.com/ubuntu xenial-updates/main DEP-11 64x64 Icons [213 kB]
Get:21 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages [540 kB]
Get:22 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe i386 Packages [516 kB]
Get:23 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 DEP-11 Metadata [173 kB]
Get:24 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe DEP-11 64x64 Icons [240 kB]
Get:25 http://us.archive.ubuntu.com/ubuntu xenial-updates/multiverse amd64 DEP-11 Metadata [5,888 B]
Get:26 http://us.archive.ubuntu.com/ubuntu xenial-backports/main amd64 DEP-11 Metadata [3,328 B]
Get:27 http://us.archive.ubuntu.com/ubuntu xenial-backports/universe amd64 DEP-11 Metadata [4,584 B]
Hit:28 https://download.owncloud.org/download/repositories/stable/Ubuntu_16.04 Release
Fetched 3,809 kB in 1s (1,932 kB/s)
Reading package lists... Done
$ sudo apt-get install owncloud
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package owncloud 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
However the following packages replace it:
owncloud-files
E: Package 'owncloud' has no installation candidate
这就是我按照步骤操作时发生的一切，它仍然说没有 'owncloud' 安装候选。
这里的问题是 ownCloud 最近删除了 owncloud 元数据包（这在同时托管多个应用程序的环境中可能有害）。 owncloud-files 包的区别是 described in the docs:
owncloud-files (recommended): This package installs only ownCloud. It does not install Apache, a database, or any PHP dependencies.
owncloud: This package installs ownCloud, complete with all dependencies.
所以，基本上，您在系统上下载并安装了 ownCloud（您会看到它位于 /var/www/owncloud 目录下。）- 但现在它缺少依赖项。您需要手动安装它们；您可以在以下位置看到一个列表：https://doc.owncloud.org/server/10.0/admin_manual/installation/source_installation.html#install-the-required-packages:
sudo apt install -y apache2 mariadb-server libapache2-mod-php7.0 \
php7.0-gd php7.0-json php7.0-mysql php7.0-curl \
php7.0-intl php7.0-mcrypt php-imagick \
php7.0-zip php7.0-xml php7.0-mbstring
安装后，系统会提示您使用 DigitalOcean 教程中缺少的 apache 向导。从那里您将能够自定义服务器安装。如果您需要有关如何完成该过程的更多信息，请参阅：configuring the apache server and completing the installation