I messed up the update process from 19.10 to 20.04

Question

I did do-release-upgrade -dc to check if I get 20.04 (I didn't get it without -d) and I go it, so I ran do-release-upgrade -d and all was fine. But then I cancelled the download of the packages because my internet was too bad and I decided to do somewhere else at a different time. When I had better internet, do-release-upgrade -d gave me "Install all updates before updating". BUT my system was already on the fossa repos. I checked, no option to bypass that, so okay, apt full-upgrade. That errored and said I should do apt --fix-broken install and it was fixed. So another apt full-upgrade to finish updating. Then I wanted to do do-release-upgrade -d again but my system is already an fossa. Can I leave it in this state (debian updates like this, so I assume it's okay) or should I do some post-install steps?

Answer 1

You have to:

1. Ensure that you do not have eoan in the sources.lists by something like

   grep "^deb.*eoan" -r /etc/apt/ --include="*.list"
   

   Change all eoan to focal by hand or by

   cd /etc/apt/sources.list.d
   sudo sed -i "s/eoan/focal/" some.list
   

2. Get fresh package lists

   sudo apt-get update
   

3. Get all newest dependencies for current release

   sudo apt-get dist-upgrade