i have installed the latest version of openwrt image 1.5.3 on my arduino yun. im having problem on opkg update via ssh. it shows "signature check failed" and "remove wrong signature file".
Do a search on those error messages, and you will find a lot of discussion on it, as well as several suggestions to get it working. The most common reason appears to be an incorrect system time on the Yun: make sure your time zone is properly set, and that the time is correct.