Setup local packages repository

Using the YunDiscSpaceExpander sketch, I get this:

Ready to install utility software. Please ensure your Arduino Yun is connected to internet.
Ready to proceed (yes/no)? yes
Updating software list...
err. with opkg, check internet connection

(btw, board is online, I checked)

Again, no opkg packages are coming whatsoever. I have no clue how to update. I have tried for two days all solutions I could find!!!