Try to delete these files from filebox.

/var/cache/apt/pkgcache.bin
/var/cache/apt/srcpkgcache

or in x-terminal

sudogainroot
rm /var/cache/apt/pkgcache.bin
rm /var/cache/apt/srcpkgcache

then

apt-get autoremove
apt-get autoclean
apt-get clean
apt-get install -f
apt-get update -f
apt-get update

Let me know how it goes