Found a workaround, but beware here be dragons and this could kill your OS install! Do not do this unless you know what you are doing!
After do-release-upgrade -d fails cd /var/cache/apt sudo dpkg --force-depends --force-breaks -i libnss-nis_3.1-0ubuntu4_amd64.deb This will install the package that fails regardless missing deps and the possibility of breaking glibc. Try upgrading again sudo do-release-upgrade -d This worked for me. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1899272 Title: upgrade to 20.10 beta from 20.04 fails immediate configuration To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1899272/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
