root@Gargoyle:~# opkg update
Downloading http://downloads.openwrt.org/releases/18.06-SNAPSHOT/packages/x86_64/base/Packages.gz
Updated list of available packages in /var/opkg-lists/openwrt_18.06-snapshot_base
Downloading http://downloads.openwrt.org/releases/18.06-SNAPSHOT/packages/x86_64/base/Packages.sig
Signature check passed.
Downloading http://downloads.openwrt.org/releases/18.06-SNAPSHOT/packages/x86_64/management/Packages.gz
*** Failed to download the package list from http://downloads.openwrt.org/releases/18.06-SNAPSHOT/packages/x86_64/management/Packages.gz

Downloading http://downloads.openwrt.org/releases/18.06-SNAPSHOT/packages/x86_64/packages/Packages.gz
Updated list of available packages in /var/opkg-lists/openwrt_18.06-snapshot_packages
Downloading http://downloads.openwrt.org/releases/18.06-SNAPSHOT/packages/x86_64/packages/Packages.sig
Signature check passed.
Downloading http://downloads.openwrt.org/releases/18.06-SNAPSHOT/packages/x86_64/routing/Packages.gz
Updated list of available packages in /var/opkg-lists/openwrt_18.06-snapshot_routing
Downloading http://downloads.openwrt.org/releases/18.06-SNAPSHOT/packages/x86_64/routing/Packages.sig
Signature check passed.
Downloading http://downloads.openwrt.org/releases/18.06-SNAPSHOT/packages/x86_64/telephony/Packages.gz
Updated list of available packages in /var/opkg-lists/openwrt_18.06-snapshot_telephony
Downloading http://downloads.openwrt.org/releases/18.06-SNAPSHOT/packages/x86_64/telephony/Packages.sig
Signature check passed.
Downloading http://www.gargoyle-router.com/packages/gargoyle-1.12/x86/x64/Packages.gz
*** Failed to download the package list from http://www.gargoyle-router.com/packages/gargoyle-1.12/x86/x64/Packages.gz

Downloading http://downloads.openwrt.org/releases/18.06-SNAPSHOT/targets/x86/64/packages/Packages.gz
Updated list of available packages in /var/opkg-lists/openwrt_core
Downloading http://downloads.openwrt.org/releases/18.06-SNAPSHOT/targets/x86/64/packages/Packages.sig
Signature check passed.
Downloading http://downloads.openwrt.org/releases/18.06-SNAPSHOT/packages/x86_64/base/Packages.gz
Updated list of available packages in /var/opkg-lists/openwrt_base
Downloading http://downloads.openwrt.org/releases/18.06-SNAPSHOT/packages/x86_64/base/Packages.sig
Signature check passed.
Collected errors:
 * opkg_conf_parse_file: Duplicate src declaration (gargoyle http://www.gargoyle-router.com/packages/gargoyle-1.12/x86/x64). Skipping.
 * opkg_download: Failed to download http://downloads.openwrt.org/releases/18.06-SNAPSHOT/packages/x86_64/management/Packages.gz, wget returned 8.
 * opkg_download: Failed to download http://www.gargoyle-router.com/packages/gargoyle-1.12/x86/x64/Packages.gz, wget returned 8.