Fixing damaged /var/lib/dpkg/available
Thanks to the person at
pointing out this message to fix a broken /var/lib/dpkg/available.
In my case a version update from Linux MInt 16 to 17 went wrong and corrupted that file. this did the trick:
# mv /var/lib/dpkg/available /root/
# touch /var/lib/dpkg/available
# sh -c 'for i in /var/lib/apt/lists/*_Packages; do dpkg --merge-avail "$i"; done'