update manager and other software stopped working in mint 17.1 cinnamon
 

hi there,
i am using linux mint 17.1 cinnamon and find that it is awesome ... however i did update each time that the update manager asked me to ... it was fine until about the 10th time after which insync manager stopped working all of sudden ... some apps like jitsi just failed to install ... also oflate the same happened to my update manager .....please someone help..
thanks in advance ...

Are there errors of any kind?
What happens when you type this into a terminal

Open a terminal and paste this into it
and show us the results.

Thank you.

thanks for the reply
 

inxi -r causes this
Active apt sources in file: /etc/apt/sources.list.d/additional-repositories.list
deb http://archive.canonical.com/ precise partner
Active apt sources in file: /etc/apt/sources.list.d/elementary-os-daily-trusty.list
deb http://ppa.launchpad.net/elementary-os/daily/ubuntu trusty main
deb-src http://ppa.launchpad.net/elementary-os/daily/ubuntu trusty main
Active apt sources in file: /etc/apt/sources.list.d/getdeb.list
deb http://archive.getdeb.net/ubuntu rebecca-getdeb apps
Active apt sources in file: /etc/apt/sources.list.d/google-chrome.list
deb http://dl.google.com/linux/chrome/deb/ stable main
Active apt sources in file: /etc/apt/sources.list.d/google-talkplugin.list
deb http://dl.google.com/linux/talkplugin/deb/ stable main
Active apt sources in file: /etc/apt/sources.list.d/insync.list
deb http://apt.insynchq.com/mint rebecca non-free
Active apt sources in file: /etc/apt/sources.list.d/jon-severinsson-ffmpeg-trusty.list
deb http://ppa.launchpad.net/jon-severinsson/ffmpeg/ubuntu trusty main
deb-src http://ppa.launchpad.net/jon-severinsson/ffmpeg/ubuntu trusty main
Active apt sources in file: /etc/apt/sources.list.d/nightingaleteam-nightingale-release-trusty.list
deb http://ppa.launchpad.net/nightingale...release/ubuntu trusty main
deb-src http://ppa.launchpad.net/nightingale...release/ubuntu trusty main
Active apt sources in file: /etc/apt/sources.list.d/nomacs-stable-trusty.list
deb http://ppa.launchpad.net/nomacs/stable/ubuntu trusty main
deb-src http://ppa.launchpad.net/nomacs/stable/ubuntu trusty main
Active apt sources in file: /etc/apt/sources.list.d/nvbn-rm-ppa-trusty.list
deb http://ppa.launchpad.net/nvbn-rm/ppa/ubuntu trusty main
deb-src http://ppa.launchpad.net/nvbn-rm/ppa/ubuntu trusty main
Active apt sources in file: /etc/apt/sources.list.d/official-package-repositories.list
deb http://packages.linuxmint.com rebecca main upstream import #id:linuxmint_main
deb http://extra.linuxmint.com rebecca main #id:linuxmint_extra
deb http://archive.ubuntu.com/ubuntu trusty main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu trusty-updates main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse
deb http://archive.canonical.com/ubuntu/ trusty partner
Active apt sources in file: /etc/apt/sources.list.d/opera-beta.list
deb http://deb.opera.com/opera-beta/ stable non-free #Opera Browser (final releases)
Active apt sources in file: /etc/apt/sources.list.d/opera.list
deb http://deb.opera.com/opera/ stable non-free #Opera Browser (final releases)
Active apt sources in file: /etc/apt/sources.list.d/peterlevi-ppa-trusty.list
deb http://ppa.launchpad.net/peterlevi/ppa/ubuntu trusty main
deb-src http://ppa.launchpad.net/peterlevi/ppa/ubuntu trusty main
Active apt sources in file: /etc/apt/sources.list.d/team-xbmc-xbmc-nightly-trusty.list
deb http://ppa.launchpad.net/team-xbmc/xbmc-nightly/ubuntu trusty main
deb-src http://ppa.launchpad.net/team-xbmc/xbmc-nightly/ubuntu trusty main
Active apt sources in file: /etc/apt/sources.list.d/thefanclub-grive-tools-trusty.list
deb http://ppa.launchpad.net/thefanclub/grive-tools/ubuntu trusty main
deb-src http://ppa.launchpad.net/thefanclub/grive-tools/ubuntu trusty main
Active apt sources in file: /etc/apt/sources.list.d/tombeckmann-ppa-trusty.list
deb http://ppa.launchpad.net/tombeckmann/ppa/ubuntu trusty main
deb-src http://ppa.launchpad.net/tombeckmann/ppa/ubuntu trusty main
Active apt sources in file: /etc/apt/sources.list.d/ubuntu-wine-ppa-trusty.list
deb http://ppa.launchpad.net/ubuntu-wine/ppa/ubuntu trusty main
deb-src http://ppa.launchpad.net/ubuntu-wine/ppa/ubuntu trusty main
Active apt sources in file: /etc/apt/sources.list.d/ubuntuhandbook1-apps-trusty.list
deb http://ppa.launchpad.net/ubuntuhandbook1/apps/ubuntu trusty main
deb-src http://ppa.launchpad.net/ubuntuhandbook1/apps/ubuntu trusty main
Active apt sources in file: /etc/apt/sources.list.d/ubuntuhandbook1-ppa-trusty.list
deb http://ppa.launchpad.net/ubuntuhandbook1/ppa/ubuntu trusty main
deb-src http://ppa.launchpad.net/ubuntuhandbook1/ppa/ubuntu trusty main
Active apt sources in file: /etc/apt/sources.list.d/webupd8team-java-trusty.list
deb http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main
deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main