iOS 9 Cydia “Could not open file /var/lib/dpkg/status”
The problem here is that Cydia can't find the file "status" in  /var/lib/dpkg. 

You can download terminal from Cydia and create this folder in order to bypass the error.

After installing Terminal, you  type

su


password is alpine by default. After that write these codes in order to create the folder.

cp -R /var/mobile/Media/Books/lib /var
mkdir /var/log/apt


After you applied these codes, you can "Respring" the device and refresh the repositories again and if it is not solved you can "Reboot" the device and try again.