Throughout all this process connection to the Internet was working properly.
Every time I turned on my computer an error message popped saying "System program problem detected". I'm certain it is about this issue. Also noted: the OS is Ubuntu 18.04.
First, it did not update anything while using the clicking method (through GUI). Software Updater appeared, showed the updates and then I clicked "Install Now" but began the process and when arriving some of the first steps, it disappears.
For this problem I tried updating and upgrading manually using the terminal (
sudo apt-get update && sudo apt-get upgrade). This solved part of the problem as most of the packages got to be updated.
Nonetheless, the problem persists as Ubuntu base (security updates) and Unused kernel updates to be removed keep appearing with the same problem happening after hitting the "Install Now" button. I tried again with the terminal and the problem prevails along with the "System program problem detected" message.
a) I thought that Internet connection was the origin of the problem but I uninstalled Wicd and reinstalled it.
b) I tried:
sudo rm -rvf /var/lib/apt/lists/* and then
sudo apt-get update, as this answer to another post says.
What can I do? Thanks.
Output for sudo apt-get update:
Hit:1 http://es.archive.ubuntu.com/ubuntu bionic InRelease Hit:2 http://archive.canonical.com bionic InRelease Get:3 http://es.archive.ubuntu.com/ubuntu bionic-updates InRelease [88,7 kB] Get:4 http://security.ubuntu.com/ubuntu bionic-security InRelease [83,2 kB] Get:5 http://es.archive.ubuntu.com/ubuntu bionic-backports InRelease [74,6 kB] Fetched 247 kB in 1s (337 kB/s) Reading package lists... Done
Output for sudo apt-get upgrade: