Critical issue after full-upgrade

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Hi, @mendy :slight_smile:

I'm afraid that I'm having some difficulty understanding what you're asking. Having said that, let me quote some excerpts from the following web page that I believe are relevant in this context:

https://ubuntu.com/server/docs/package-management

From that web page, the excerpts that seem to me to be the most relevant are the following ones (my apologies if you know all of this already):

" (...)

Advanced Packaging Tool – APT

The apt command is a powerful command-line tool, which works with Ubuntu’s Advanced Packaging Tool (APT). The commands contained within apt provide the means for installing new software packages, upgrading existing software packages, updating the package list index, and even upgrading the entire Ubuntu system.
(...)

  • Update the package index
    The APT package index is essentially a database of available packages from the repositories defined in the /etc/apt/sources.list file and in the /etc/apt/sources.list.d directory. To update the local package index with the latest changes made in the repositories, type the following:
    sudo apt update

Actions of the apt command, such as installation and removal of packages, are logged in the /var/log/dpkg.log log file.

For further information about the use of APT, read the comprehensive APT User’s Guide, or type apt help
(...)

dpkg

dpkg is a package manager for Debian-based systems. It can install, remove, and build packages, but unlike other package management systems, it cannot automatically download and install packages – or their dependencies. APT and Aptitude are newer, and layer additional features on top of dpkg. This section covers using dpkg to manage locally installed packages:

  • To list all packages in the system’s package database, installed and uninstalled, from a terminal prompt type:
    dpkg -l

(...)"

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