Thanks for the pointer @falconertc, that ended up being my problem as well. I solved it following the instructions posted here: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1577926/comments/18
Thanks for the pointer @falconertc, that ended up being my problem as well. I solved it following the instructions posted here: https:/ /bugs.launchpad .net/ubuntu/ +source/ apt/+bug/ 1577926/ comments/ 18