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Hi there,
I'm trying to install libffi-dev and receiving this error [1]:
 libffi-dev : Depends: libffi6 (= 3.2.1-4) but 3.2.1-6 is to be installed

However, my system already had the libff6=3.2.1-6 [2,3].
I also tried updating and installing this package, however did not work [4].

I would appreciate your feedback on this.

Thanks a lot,

Info about my system:
$ uname -a
Linux pooja-XPS-13-9360 4.13.0-46-generic #51-Ubuntu SMP Tue Jun 12 12:36:29 
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux


[1]
*************************************
$ sudo apt-get install libffi-dev
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:
 libffi-dev : Depends: libffi6 (= 3.2.1-4) but 3.2.1-6 is to be installed
E: Unable to correct problems, you have held broken packages.

[2]
*************************************

$ sudo apt-get install libffi6
Reading package lists... Done
Building dependency tree       
Reading state information... Done
libffi6 is already the newest version (3.2.1-6).
0 upgraded, 0 newly installed, 0 to remove and 10 not upgraded.

[3]
*************************************
$ apt-cache policy libffi-dev
libffi-dev:
  Installed: (none)
  Candidate: 3.2.1-4
  Version table:
     3.2.1-4 500
        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages

[4]
********************************************
$ sudo apt-get update && sudo apt-get install libffi-dev
Hit:1 https://repo.skype.com/deb unstable InRelease                             
                                                                            
Hit:2 http://ppa.launchpad.net/brightbox/ruby-ng/ubuntu artful InRelease        
                                                                            
Hit:3 https://packages.sury.org/php stretch InRelease                           
                                                                            
Ign:4 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu artful InRelease           
                                                                            
Hit:5 http://ppa.launchpad.net/ondrej/php/ubuntu artful InRelease               
                                                                            
Hit:6 http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu artful InRelease  
                                                                            
Ign:7 http://ppa.launchpad.net/webupd8team/unstable/ubuntu artful InRelease     
                                                                            
Err:8 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu artful Release             
                                                                            
  404  Not Found [IP: 91.189.95.85 80]
Err:9 http://ppa.launchpad.net/webupd8team/unstable/ubuntu artful Release       
                                                                            
  404  Not Found [IP: 91.189.95.85 80]
Hit:10 http://dl.google.com/linux/chrome/deb stable InRelease                   
                                                                            
Ign:11 http://archive.ubuntu.com/ubuntu xenial InRelease                        
                                                                            
Ign:12 http://archive.ubuntu.com/ubuntu xenial-updates InRelease                
                                                                            
Ign:13 http://archive.ubuntu.com/ubuntu xenial-backports InRelease              
                                                                            
Ign:14 http://archive.ubuntu.com/ubuntu artful InRelease                        
                                                                            
Ign:15 http://archive.ubuntu.com/ubuntu vivid InRelease                         
                                                                            
Err:16 http://archive.ubuntu.com/ubuntu xenial Release                          
                                                                            
  Cannot initiate the connection to archive.ubuntu.com:80 
(2001:67c:1360:8001::23). - connect (101: Network is unreachable) [IP: 
2001:67c:1360:8001::23 80]
Err:17 http://archive.ubuntu.com/ubuntu xenial-updates Release                  
                                                                            
  Cannot initiate the connection to archive.ubuntu.com:80 
(2001:67c:1360:8001::23). - connect (101: Network is unreachable) [IP: 
2001:67c:1360:8001::23 80]
Ign:18 https://deb.etcher.io stable InRelease                                   
                                                                            
Ign:19 https://dl.yarnpkg.com/debian stable InRelease                           
                                                                            
Err:20 http://archive.ubuntu.com/ubuntu xenial-backports Release                
                                                                            
  Cannot initiate the connection to archive.ubuntu.com:80 
(2001:67c:1360:8001::23). - connect (101: Network is unreachable) [IP: 
2001:67c:1360:8001::23 80]
Err:21 http://archive.ubuntu.com/ubuntu artful Release                          
                                                                            
  Cannot initiate the connection to archive.ubuntu.com:80 
(2001:67c:1360:8001::23). - connect (101: Network is unreachable) [IP: 
2001:67c:1360:8001::23 80]
Err:22 http://archive.ubuntu.com/ubuntu vivid Release                           
                                                                            
  Cannot initiate the connection to archive.ubuntu.com:80 
(2001:67c:1360:8001::23). - connect (101: Network is unreachable) [IP: 
2001:67c:1360:8001::23 80]
Err:23 https://deb.etcher.io stable Release                                     
                                                                          
  Cannot initiate the connection to deb.etcher.io:443 
(2606:4700:3030::6815:5d19). - connect (101: Network is unreachable) [IP: 
2606:4700:3030::6815:5d19 443]
Err:24 https://dl.yarnpkg.com/debian stable Release                             
                                                                          
  Cannot initiate the connection to dl.yarnpkg.com:443 (2606:4700::6810:ab63). 
- connect (101: Network is unreachable) [IP: 2606:4700::6810:ab63 443]
Hit:25 http://archive.canonical.com/ubuntu xenial InRelease                     
                                                                          
Hit:26 http://security.ubuntu.com/ubuntu xenial-security InRelease              
                                                                          
Ign:27 https://dl.bintray.com/sbt/debian  InRelease                             
                                                   
Get:28 https://dl.bintray.com/sbt/debian  Release [815 B]                       
 
Hit:29 https://packagecloud.io/slacktechnologies/slack/debian jessie InRelease
Reading package lists... Done 
E: The repository 'http://ppa.launchpad.net/deadsnakes/ppa/ubuntu artful 
Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore 
disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration 
details.
E: The repository 'http://ppa.launchpad.net/webupd8team/unstable/ubuntu artful 
Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore 
disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration 
details.
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in 
/etc/apt/sources.list.d/google-chrome.list:3 and 
/etc/apt/sources.list.d/google-chrome.list:4
W: Target Packages (main/binary-all/Packages) is configured multiple times in 
/etc/apt/sources.list.d/google-chrome.list:3 and 
/etc/apt/sources.list.d/google-chrome.list:4
W: Target Translations (main/i18n/Translation-en_US) is configured multiple 
times in /etc/apt/sources.list.d/google-chrome.list:3 and 
/etc/apt/sources.list.d/google-chrome.list:4
W: Target Translations (main/i18n/Translation-en) is configured multiple times 
in /etc/apt/sources.list.d/google-chrome.list:3 and 
/etc/apt/sources.list.d/google-chrome.list:4
W: Target DEP-11 (main/dep11/Components-amd64.yml) is configured multiple times 
in /etc/apt/sources.list.d/google-chrome.list:3 and 
/etc/apt/sources.list.d/google-chrome.list:4
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times 
in /etc/apt/sources.list.d/google-chrome.list:3 and 
/etc/apt/sources.list.d/google-chrome.list:4
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple 
times in /etc/apt/sources.list.d/google-chrome.list:3 and 
/etc/apt/sources.list.d/google-chrome.list:4
N: Skipping acquire of configured file 'main/binary-i386/Packages' as 
repository 'http://dl.google.com/linux/chrome/deb stable InRelease' doesn't 
support architecture 'i386'
E: The repository 'http://archive.ubuntu.com/ubuntu xenial Release' no longer 
has a Release file.
N: Updating from such a repository can't be done securely, and is therefore 
disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration 
details.
E: The repository 'http://archive.ubuntu.com/ubuntu xenial-updates Release' no 
longer has a Release file.
N: Updating from such a repository can't be done securely, and is therefore 
disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration 
details.
E: The repository 'http://archive.ubuntu.com/ubuntu xenial-backports Release' 
no longer has a Release file.
N: Updating from such a repository can't be done securely, and is therefore 
disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration 
details.
E: The repository 'http://archive.ubuntu.com/ubuntu artful Release' does not 
have a Release file.
N: Updating from such a repository can't be done securely, and is therefore 
disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration 
details.
E: The repository 'http://archive.ubuntu.com/ubuntu vivid Release' does not 
have a Release file.
N: Updating from such a repository can't be done securely, and is therefore 
disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration 
details.
E: The repository 'https://deb.etcher.io stable Release' no longer has a 
Release file.
N: Updating from such a repository can't be done securely, and is therefore 
disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration 
details.
E: The repository 'https://dl.yarnpkg.com/debian stable Release' no longer has 
a Release file.
N: Updating from such a repository can't be done securely, and is therefore 
disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration 
details.
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in 
/etc/apt/sources.list.d/google-chrome.list:3 and 
/etc/apt/sources.list.d/google-chrome.list:4
W: Target Packages (main/binary-all/Packages) is configured multiple times in 
/etc/apt/sources.list.d/google-chrome.list:3 and 
/etc/apt/sources.list.d/google-chrome.list:4
W: Target Translations (main/i18n/Translation-en_US) is configured multiple 
times in /etc/apt/sources.list.d/google-chrome.list:3 and 
/etc/apt/sources.list.d/google-chrome.list:4
W: Target Translations (main/i18n/Translation-en) is configured multiple times 
in /etc/apt/sources.list.d/google-chrome.list:3 and 
/etc/apt/sources.list.d/google-chrome.list:4
W: Target DEP-11 (main/dep11/Components-amd64.yml) is configured multiple times 
in /etc/apt/sources.list.d/google-chrome.list:3 and 
/etc/apt/sources.list.d/google-chrome.list:4
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times 
in /etc/apt/sources.list.d/google-chrome.list:3 and 
/etc/apt/sources.list.d/google-chrome.list:4
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple 
times in /etc/apt/sources.list.d/google-chrome.list:3 and 
/etc/apt/sources.list.d/google-chrome.list:4

** Affects: libffi (Ubuntu)
     Importance: Undecided
         Status: New

-- 
failed to install libffi-dev  package
https://bugs.launchpad.net/bugs/1917620
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