安装 rvm rails - 未满足的依赖项 libffi-dev 依赖于 libffi6 - Ubuntu 14.04.4 LTS
install rvm rails - unmet dependencies libffi-dev depends libffi6 - Ubuntu 14.04.4 LTS
在 Ubuntu 14.04.4 上安装 rvm rails：
\curl -L https://get.rvm.io | bash -s stable --ruby
输出显示：
rvm 1.26.11 (latest) by Wayne E. Seguin <wayneeseguin@gmail.com>, Michal Papis <mpapis@gmail.com> [https://rvm.io/]
Searching for binary rubies, this might take some time.
Found remote file https://rvm_io.global.ssl.fastly.net/binaries/ubuntu/14.04/x86_64/ruby-2.2.1.tar.bz2
最终错误：
The following packages have unmet dependencies:
libffi-dev : Depends: libffi6 (= 3.1~rc1+r3.0.13-12) but 3.1~rc1+r3.0.13-12ubuntu0.1 is to be installed
我试过：
sudo apt-get update
sudo apt-get upgrade
\curl -L https://get.rvm.io | bash -s stable --ruby
没有修复。
我的 /etc/apt/sources.list 如下所示：
deb http://archive.ubuntu.com/ubuntu trusty main multiverse universe restricted
deb http://archive.ubuntu.com/ubuntu trusty-security main multiverse universe restricted
根据我的搜索，我需要下载 3.1~rc1+r3.0.13-12ubuntu0.1 软件包并手动安装？如果是这种情况，我该怎么做？
另外我想知道为什么这个包不是最新版本 - 也许是一个愚蠢的问题，但我不明白可能是什么原因？
正在使用 apt-get 安装这些软件包：
$ sudo apt-get install libffi6
libffi6 is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
$ sudo apt-get install libffi-dev
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:
libffi-dev : Depends: libffi6 (= 3.1~rc1+r3.0.13-12) but 3.1~rc1+r3.0.13-12ubuntu0.1 is to be installed
E: Unable to correct problems, you have held broken packages.
尝试安装 libffi6。
apt-get install libffi6
如果它不起作用，请像这样尝试：
将 deb http://cz.archive.ubuntu.com/ubuntu trusty main 添加到 /etc/apt/sources.list
然后：
apt-get update && apt-get upgrade
apt-get install libffi6
我最终使用了 aptitude 并选择了非默认选项来降级 libffi6 软件包以允许安装 libffi-dev：
sudo aptitude install libffi-dev
在 Ubuntu 14.04.4 上安装 rvm rails：
\curl -L https://get.rvm.io | bash -s stable --ruby
输出显示：
rvm 1.26.11 (latest) by Wayne E. Seguin <wayneeseguin@gmail.com>, Michal Papis <mpapis@gmail.com> [https://rvm.io/]
Searching for binary rubies, this might take some time.
Found remote file https://rvm_io.global.ssl.fastly.net/binaries/ubuntu/14.04/x86_64/ruby-2.2.1.tar.bz2
最终错误：
The following packages have unmet dependencies:
libffi-dev : Depends: libffi6 (= 3.1~rc1+r3.0.13-12) but 3.1~rc1+r3.0.13-12ubuntu0.1 is to be installed
我试过：
sudo apt-get update
sudo apt-get upgrade
\curl -L https://get.rvm.io | bash -s stable --ruby
没有修复。
我的 /etc/apt/sources.list 如下所示：
deb http://archive.ubuntu.com/ubuntu trusty main multiverse universe restricted
deb http://archive.ubuntu.com/ubuntu trusty-security main multiverse universe restricted
根据我的搜索，我需要下载 3.1~rc1+r3.0.13-12ubuntu0.1 软件包并手动安装？如果是这种情况，我该怎么做？
另外我想知道为什么这个包不是最新版本 - 也许是一个愚蠢的问题，但我不明白可能是什么原因？
正在使用 apt-get 安装这些软件包：
$ sudo apt-get install libffi6
libffi6 is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
$ sudo apt-get install libffi-dev
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:
libffi-dev : Depends: libffi6 (= 3.1~rc1+r3.0.13-12) but 3.1~rc1+r3.0.13-12ubuntu0.1 is to be installed
E: Unable to correct problems, you have held broken packages.
尝试安装 libffi6。
apt-get install libffi6
如果它不起作用，请像这样尝试：
将 deb http://cz.archive.ubuntu.com/ubuntu trusty main 添加到 /etc/apt/sources.list
然后：
apt-get update && apt-get upgrade
apt-get install libffi6
我最终使用了 aptitude 并选择了非默认选项来降级 libffi6 软件包以允许安装 libffi-dev：
sudo aptitude install libffi-dev