Ubuntu – Can’t run apt-get upgrade ubuntu 14.04 gnome

I am currently using ubuntu 14.04 with gnome shell 3.10.4(I downgraded from gnome 3.12) but ran in a problem:
I can't install anything!
If I do

sudo apt-get upgrade

I get the following

Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: The package gnome-accessibility-themes needs to be reinstalled, but can't find an archive for it.

If I try to run :

sudo apt-get install gnome-accessibility-themes

The same error pops out

Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: The package gnome-accessibility-themes needs to be reinstalled, but can't find an archive for it.

then I ran :

sudo apt-get remove gnome-accessibility-themes

but still the same error came!
Even Aptitude doesn't help.
How do I resolve this issue?