I tried to upgrade from 17.10 to 18.04 using both software updater and 'do-release-upgrade' command. I am getting below error message. My internet connection is working fine. How can i correctly upgrade to 18.04 release.
Could not download the upgrades
The upgrade has aborted. Please check your Internet connection or
installation media and try again. All files downloaded so far have
been kept.
Failed to fetch
http://ubuhttps://askubuntu.com/users/login?ssrc=head&returnurl=https%3a%2f%2faskubuntu.com%2fquestions%2f1028787%2fuse-old-ppa-if-new-ppa-is-not-available-for-new-ubuntu-versionntu.mirrors.tds.net/pub/ubuntu/pool/main/libg/libgd2/libgd3_2.2.5-4ubuntu0.2_amd64.deb
404 Not Found
