Error while trying to install something on the terminal

[gaas]

You may be getting distracted by cpufrequtils.
From what I've read here, it seems the problem relates to dependencies associated with linux-tools-common.
cpufrequtils doesn't have any link (as far as I can see) to linux-tools-common

I don't think that cpufrequtils got installed - the uninstall command couldn't find it.

Il pacchetto "cpufrequtils" non è installato e quindi non è stato rimosso

Trying to install cpufrequtils may have been the first time you noted apt reporting a problem.

The inference I make is that something installed *before* cpufrequtils has caused the dependency issue.

If you search the command line history before cpufrequtils, you may find something.
Or if you were using the GUI, we may need to look into other logs.

Unless we find the root cause, we can't try to fix it.
It may be more efficient to re-install.

I reinstalled linux, didn't have any important files anyway