由于erlang依赖项版本不正确，无法安装rabbitmq

Question

我已经erlang 21.3安装了：

$ erl -eval 'erlang:display(erlang:system_info(otp_release)), halt().'  -noshell
"21"

但rabbitmq安装者并不这么认为：

sudo apt-get install -y rabbitmq-server
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 rabbitmq-server : Depends: erlang-base (>= 1:21.3) but 1:20.2.2+dfsg-1ubuntu2 is to be installed or
                            erlang-base-hipe (>= 1:21.3) but it is not going to be installed or
                            esl-erlang (>= 1:21.3) but it is not installable
                   Depends: erlang-crypto (>= 1:21.3) but 1:20.2.2+dfsg-1ubuntu2 is to be installed or
                            esl-erlang (>= 1:21.3) but it is not installable
                   Depends: erlang-eldap (>= 1:21.3) but 1:20.2.2+dfsg-1ubuntu2 is to be installed or
                            esl-erlang (>= 1:21.3) but it is not installable
                   Depends: erlang-inets (>= 1:21.3) but 1:20.2.2+dfsg-1ubuntu2 is to be installed or
                            esl-erlang (>= 1:21.3) but it is not installable
                   Depends: erlang-mnesia (>= 1:21.3) but 1:20.2.2+dfsg-1ubuntu2 is to be installed or
                            esl-erlang (>= 1:21.3) but it is not installable
                   Depends: erlang-os-mon (>= 1:21.3) but 1:20.2.2+dfsg-1ubuntu2 is to be installed or
                            esl-erlang (>= 1:21.3) but it is not installable
                   Depends: erlang-parsetools (>= 1:21.3) but 1:20.2.2+dfsg-1ubuntu2 is to be installed or
                            esl-erlang (>= 1:21.3) but it is not installable
                   Depends: erlang-public-key (>= 1:21.3) but 1:20.2.2+dfsg-1ubuntu2 is to be installed or
                            esl-erlang (>= 1:21.3) but it is not installable
                   Depends: erlang-runtime-tools (>= 1:21.3) but 1:20.2.2+dfsg-1ubuntu2 is to be installed or
                            esl-erlang (>= 1:21.3) but it is not installable
                   Depends: erlang-ssl (>= 1:21.3) but 1:20.2.2+dfsg-1ubuntu2 is to be installed or
                            esl-erlang (>= 1:21.3) but it is not installable
                   Depends: erlang-syntax-tools (>= 1:21.3) but 1:20.2.2+dfsg-1ubuntu2 is to be installed or
                            esl-erlang (>= 1:21.3) but it is not installable
                   Depends: erlang-tools (>= 1:21.3) but 1:20.2.2+dfsg-1ubuntu2 is to be installed or
                            esl-erlang (>= 1:21.3) but it is not installable
                   Depends: erlang-xmerl (>= 1:21.3) but 1:20.2.2+dfsg-1ubuntu2 is to be installed or
                            esl-erlang (>= 1:21.3) but it is not installable
E: Unable to correct problems, you have held broken packages.

注意：以下问题是类似的 - 但这些RedHat说明yum install并不直接适用于apt-get 在 Red Hat 上安装 RabbitMQ - 错误的 Erlang 版本

需要做什么来修复此安装过程？我在ubuntu 18.0.4.

Answer 1

以下命令序列将在 Ubuntu 18 上安装 Erlang 和 RabbitMQ，如此处所述：

export DEBIAN_FRONTEND=noninteractive

apt-get update -y

apt-get install curl gnupg -y

curl -fsSL https://github.com/rabbitmq/signing-keys/releases/download/2.0/rabbitmq-release-signing-key.asc | apt-key add -

apt-get install apt-transport-https

tee /etc/apt/sources.list.d/bintray.rabbitmq.list <<EOF
deb https://dl.bintray.com/rabbitmq-erlang/debian bionic erlang
deb https://dl.bintray.com/rabbitmq/debian bionic main
EOF

apt-get update -y

apt-get install rabbitmq-server -y --fix-missing

until lsof -i:5672; do echo "Waiting for RabbitMQ to start..."; sleep 1; done
rabbitmq-plugins enable rabbitmq_management

如果您选择从源代码安装 Erlang，那么您需要自己安装，我建议您使用generic-unixRabbitMQ 软件包。

Answer 2

我在安装 Elixir 时遇到了类似的问题。我相信原因是现有的 erlang 安装阻止了两个不同软件包提供的所需版本的 erlang 的安装。

对我来说，安装 esl-erlang 和 elixir 解决了这个问题，例如sudo apt-get install elixir esl-erlang. 因此，您可能需要显式安装所需版本的 erlang-base 或 esl-erlang。