That happens instantly on re-launching the Cydia on a jailbroken iOS 9 devices, and as a result the Cydia app cannot perform and fails. And the users cannot use all the jailbreak tweaks and installation packages.
If you are using anyone of iDevice on iOS 9 and after jailbreaking you are facing such an issue, then follow the underneath steps to overcome the issue. Here we will fix that issue easily.
Steps to fix Cydia error ‘failed to fetch’ after Jailbreak on iOS 9
• Connect your device via DATA (3G/4G), and disable Wi-Fi network on the device.
• Now from source tab click on refresh, and the error “failed to fetch” will reappears however without some part of the first error.
• Now re-tap on the refresh button on the source tab will solve the issue and the status bar will show the message “reloading data” after that you will No more face the error.
• After reloading you will able to use and install more jailbreak apps and tweaks on Cydia.
That all, hopes this will solve the Cydia error ‘failed to fetch’ after Jailbreak on iOS 9.