Comment 7 for bug 1787712

In my case I am trying to update from Ubuntu 18.04 to 18.10 and get the same behaviour (apart from the distribution name):

Reading cache

Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Hit http://archive.ubuntu.com/ubuntu bionic InRelease
Hit http://archive.canonical.com/ubuntu bionic InRelease
Hit http://archive.ubuntu.com/ubuntu bionic-updates InRelease
Hit http://archive.ubuntu.com/ubuntu bionic-backports InRelease
Ign http://dl.google.com/linux/chrome/deb stable InRelease
Hit http://security.ubuntu.com/ubuntu bionic-security InRelease
Hit http://dl.google.com/linux/chrome/deb stable Release
Fetched 0 B in 6s (0 B/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done

Restoring original system state

Aborting
Reading package lists... Done
Building dependency tree
Reading state information... Done
=== Command terminated with exit status 1 (Sun Feb 10 17:52:44 2019) ===