I did the jailbreak on my 4s 5.0.1 just now and can open Cydia, but when I go to any package like MyWi or 3G Unrestrictor, it says "Note: Cannot Locate Package".
Anyone know why and how to fix it?
you need to refresh your lists. I had the same issue. Go to "Changes" and hit the "Refresh" button
Try rebooting and re-opening Cydia. (in case you haven't tried it yet). Is the error message in red?