# cat /etc/opkg/customfeeds.conf
# add your custom package feeds here
#
# src/gz example_feed_name http://www.example.com/path/to/files
src/gz openwrt_dist http://openwrt-dist.sourceforge.net/releases/ar71xx/packages
src/gz openwrt_dist_luci http://openwrt-dist.sourceforge.net/releases/luci/packages
# opkg print-architecture | awk '{print $2}'
all
noarch
ar71xx
# opkg update
Downloading http://openwrt-dist.sourceforge.net/releases/ar71xx/packages/Packages.gz.
Updated list of available packages in /var/opkg-lists/openwrt_dist.
Downloading http://openwrt-dist.sourceforge.net/releases/ar71xx/packages/Packages.sig.
wget: server returned error: HTTP/1.1 404 Not Found
Signature check failed.
Remove wrong Signature file.
Downloading http://openwrt-dist.sourceforge.net/releases/luci/packages/Packages.gz.
Updated list of available packages in /var/opkg-lists/openwrt_dist_luci.
Downloading http://openwrt-dist.sourceforge.net/releases/luci/packages/Packages.sig.
wget: server returned error: HTTP/1.1 404 Not Found
Signature check failed.
Remove wrong Signature file.
Try this.
Open /etc/opkg.conf
delete the line that reads option check_signature 1
Try opkg update again and the problem should be fixed.