Hello I’ve been successfully working with an Ubuntu os for 15+ years and am currently utilising 24.04.3. After the most recent update my Software Updater doesn’t work and when i attempt to update using Terminal i get…
N: Ignoring file ‘mozilla.list.save.2’ in directory ‘/etc/apt/sources.list.d/’ as it has an invalid filename extension
N: Ignoring file ‘mozilla.list.save.1’ in directory ‘/etc/apt/sources.list.d/’ as it has an invalid filename extension
E: Conflicting values set for option Signed-By regarding source https://packages.mozilla.org/apt/ mozilla: /usr/share/keyrings/mozilla-apt-keyring.gpg != /etc/apt/keyrings/packages.mozilla.org.gpg
E: The list of sources could not be read.
I require help to remedy this situation and respectfully ask to be treated like a newbie and given clear and precise instructions in order to sort my problem/s.
Thanks in advance for any help.
Antland.
Well, you put some third party sources into your system and these cause an error with the updater due to mismatched signing keys …
You will need to talk to the provider of these third party package repositories why that is the case I guess …
(neither /usr/share/keyrings/mozilla-apt-keyring.gpg nor /etc/apt/keyrings/packages.mozilla.org.gpg are files coming from any ubuntu package)
Welcome to Ubuntu Discourse 
Let’s take a look at your sources and see what’s going on:
sudo apt install inxi
Then run
inxi -r
Post the output wrapped with code tags (use the </> icon in the composer)
Thanks
Although not quite exactly the same problem as this thread, maybe something from this other thread might help? -
To get useful messages, always update using APT from the terminal.
From terminal try: sudo apt update && sudo apt upgrade
If you have any errors you can post them here
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