Hello, today my cydia was not refreshing sources so I searched it on Google.
I came up with a fix, the
apt- get remove cydia
then
apt- get install cydia thing
but after that my cydia was not opening..
it would show the animation of it going into cydia, but halfway throughit closes by itself into the spotlight search page of my springboard.

Please help... thanks

P.S I am on a iPod Touch 4G running 4.2.1 cydia was working before I tried to fix with the terminal commands....