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I was afraid of that, Nelson Muntz. Thank you and KGIII. Thank you all for your help and your knowledgeable tips. I'll try to be more careful.

Firefox is a Mozilla search engine. I suppose "ubuntuzilla" refers to Mozilla apps for ubuntu based systems in Linux, if it's legit to begin with. I'm sure there's a way to get back home, though. Thanks for your interest, time and comments.

Thanks a lot, KGIII #deb cdrom:[Linux Mint 19.1 _Tessa_ - Release amd64 20181217]/ bionic contrib main non-free deb http://downloads.sourceforge.net/project/ubuntuzilla/mozilla/apt all main #deb cdrom:[Linux Mint 19.1 _Tessa_ - Release amd64 20181217]/ bionic contrib main non-free deb...

The error message in English reads: E:Malformed entry 2 in list file /etc/apt/sources.list (Suite), E:The list of sources could not be read.

I was updating Firefox for my Linux Mint 19.3 Tricia and something went wro ng. Now I get the message: E: Entrada 2 mal especificada en list fichero /etc/apt/sources.list (Suite) E: No se ha podido bloquear el directorio de listas Please help...I'm relatively new to Linux