问安装rvm rails -未满足的依赖项libffi-dev依赖于libffi6 -Ubuntu14.04.4lts

EN

\curl -L https://get.rvm.io | bash -s stable --ruby

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

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

sudo apt-get update
sudo apt-get upgrade 
\curl -L https://get.rvm.io | bash -s stable --ruby

deb http://archive.ubuntu.com/ubuntu trusty main multiverse universe restricted
deb http://archive.ubuntu.com/ubuntu trusty-security main multiverse universe restricted

$ 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.