opkg update stucks at downloading stage


I am facing this problem that 'opkg update' gets stuck at ...

Downloading http://downloads.arduino.cc/openwrtyun/1/packages/Packages.gz.

I tried many times (with restart/ethernet/wifi etc.) but nothing happens. Yun's internet connectivity is fine.

I am using OpenWrt - YUN version 1.5.3. The other system info is:

Firmware Version: OpenWRTYun Attitude Adjustment 1 / LuCI 0.11 Branch (0.11+svn10537)
Kernel Version: 3.3.8

any ideas?

Look for help in the Arduino Yun forums, there's a similar thread if I remember well.